The speed of light in this material is approximately 2.00 × 10^8 m/s (to three significant digits).
To determine the speed of light in a particular material, we can use Snell's law, which relates the refractive indices of the two media:
n1*sin(theta1) = n2*sin(theta2)
Where:
n1 is the refractive index of the initial medium (air, in this case)
theta1 is the angle of incidence (measured from the normal)
n2 is the refractive index of the second medium (the material)
theta2 is the angle of refraction (measured from the normal)
Given that the critical angle in air for the material is 42.0 degrees, we can find the refractive index (n2) using the equation:
n2 = 1 / sin(critical angle)
Substituting the value, we get:
n2 = 1 / sin(42.0 degrees) ≈ 1.499
Now, the speed of light in a medium is related to the refractive index by the equation:
v = c / n
where:
v is the speed of light in the material
c is the speed of light in vacuum (approximately 3.00 × 10^8 m/s)
Substituting the values, we have:
v = (3.00 × 10^8 m/s) / 1.499 ≈ 2.00 × 10^8 m/s
Therefore, the speed of light in this material is approximately 2.00 × 10^8 m/s (to three significant digits).
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220V, 50Hz, n=1400rpm, equivalent circuit parameters of one phase induction motor R1=2.9ohm, R2'=3ohm, X1=X2'=3.3ohm, Xm=56ohm When operating at the rated power of the engine;
a) current drawn from the network
b) induced rotating field strength
c) If P friction = 43W, the induced mechanical power
d) calculate efficiency.
220V, 50Hz, n=1400rpm, equivalent circuit parameters of one phase induction motor R1=2.9ohm, R2'=3ohm, X1=X2'=3.3ohm, Xm=56ohm When operating at the rated power of the engine;(a)I= 7.88 amps + j8.85 amps(b)he induced rotating field strength is: 446.8 volts(c)he induced mechanical power is Pmech =1217 watts(d)η =70.4%
a) Current drawn from the network
The current drawn from the network can be calculated using the following equation:
I = V / Z
where V is the applied voltage and Z is the impedance of the motor.
The applied voltage is 220 volts, and the impedance of the motor is:
Z = R1 + jX1 = 2.9 ohms + j3.3 ohms
Therefore, the current drawn from the network is:
I = 220 volts / (2.9 ohms + j3.3 ohms) = 7.88 amps + j8.85 amps
b) Induced rotating field strength
The induced rotating field strength can be calculated using the following equation:
E = I ×Xm
where I is the current flowing through the motor and Xm is the magnetizing reactance of the motor.
The current flowing through the motor is 7.88 amps, and the magnetizing reactance of the motor is:
Xm = 56 ohms
Therefore, the induced rotating field strength is:
E = 7.88 amps ×56 ohms = 446.8 volts
c) If P friction = 43W, the induced mechanical power
The induced mechanical power can be calculated using the following equation:
Pmech = V × I × cos(phi) - Pfric
where V is the applied voltage, I is the current flowing through the motor, phi is the power factor, and Pfric is the frictional power.
The applied voltage is 220 volts, the current flowing through the motor is 7.88 amps, the power factor is 0.8, and the frictional power is 43 watts.
Therefore, the induced mechanical power is:
Pmech = 220 volts × 7.88 amps × 0.8 - 43 watts = 1260 watts - 43 watts = 1217 watts
d) Calculate efficiency
The efficiency of the motor can be calculated using the following equation:
η = Pmech / Pinput
where Pmech is the induced mechanical power and Pinput is the input power.
The input power is the power supplied to the motor by the network, which is 220 volts × 7.88 amps = 1739 watts.
Therefore, the efficiency of the motor is:
η = 1217 watts / 1739 watts = 0.704 = 70.4%
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A line of charge of length L = 1.41 m is placed along the x axis so that the center of the line is at x =0. The line carries a charge q = 3.39 nC. Calculate the magnitude of the electric field produced by this charge at a point located at x =0, y = 0.63 m. Type your answer rounded off to 2 decimal places.
The magnitude of the electric field produced by the line of charge at the given point is 0.50 N/C.
To calculate the electric field at the point (x = 0, y = 0.63 m), we can use the principle of superposition. The electric field produced by a small element of charge on the line can be calculated using the formula for the electric field due to a point charge, which is given by:
dE = k * (dq) / r²
Where dE is the electric field produced by a small charge element dq, k is Coulomb's constant (8.99 x 10^9 N m²/C²), and r is the distance between the charge element and the point where the electric field is being measured. Since the line of charge is infinitely long, we need to integrate the contribution of each charge element along the length of the line.
Considering a small element of charge dq on the line, the distance between this element and the point (x = 0, y = 0.63 m) can be calculated using the Pythagorean theorem. The expression for dq in terms of x can be obtained by considering the linear charge density λ = q / L, where L is the length of the line of charge. Integrating the expression for dE over the entire length of the line and substituting the given values, we can calculate the magnitude of the electric field to be approximately 0.50 N/C.
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73. A small soap factory in Laguna supplies soap containing 30% water to a local hotel at P373 per 100 kilos FOB. During a stock out, a different batch of soap containing 5% water was offered instead.
The new cost of the soap containing 5% water would be cheaper. However, it is important to note that the new batch of soap may not have the same quality as the original batch containing 30% water. The hotel may also not be satisfied with the quality of the new batch and may choose to switch suppliers.
In the case of a small soap factory in Laguna that supplies soap containing 30% water to a local hotel at P373 per 100 kilos FOB and then experiencing a stock out, the factory may provide a different batch of soap containing 5% water. This will change the cost of the soap. The cost of the soap containing 30% water is calculated using:P373 per 100 kilos = (30% x 100 kilos) water + (70% x 100 kilos) soap= 30 kilos water + 70 kilos soap Therefore, the cost of the soap component is:P373/70 kilos soap = P5.33/kilo soapOn the other hand, if the soap contains 5% water, the cost of the soap will change. The cost of the soap component in this case would be:P373/95 kilos soap = P3.93/kilo soap. Therefore, the new cost of the soap containing 5% water would be cheaper. However, it is important to note that the new batch of soap may not have the same quality as the original batch containing 30% water. The hotel may also not be satisfied with the quality of the new batch and may choose to switch suppliers.
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Measure the focal distance f, the distance of the object arrow from the mirror d 0
, and the distance of its image from the mirror d 1
. Record your results here f=126.81 ∘
do=0.29 m
di=0.17 m
Question 2-2: Are your results consistent with the mirror equation? Explain. If not, discuss what you think are the reasons for the disagreement. QUESTION 2-3: Based on your observations, is the image created by a concave mirror real or virtual? Explain. QUESTION 2-4: Qualitatively, is the magnification and orientation of the image consistent with the magnification equation? Explain.
The measured values of the focal distance (f), object distance from the mirror (d₀), and image distance from the mirror (d₁) are as follows: f = 126.81°, d₀ = 0.29 m, and d₁ = 0.17 m.
In order to determine whether the results are consistent with the mirror equation, we can use the formula:
1/f = 1/d₀ + 1/d₁
Substituting the measured values, we have:
1/126.81° = 1/0.29 + 1/0.17
Solving this equation, we can determine if the left-hand side is equal to the right-hand side. If they are approximately equal, then the results are consistent with the mirror equation.
Regarding the nature of the image created by the concave mirror, we can analyze the sign of the image distance (d₁). If d₁ is positive, it indicates that the image is formed on the same side as the object and is therefore a real image. On the other hand, if d₁ is negative, it implies that the image is formed on the opposite side of the mirror and is thus a virtual image.
To determine if the magnification and orientation of the image are consistent with the magnification equation, we can use the formula:
m = -d₁/d₀
Here, m represents the magnification. If the magnification value is negative, it means the image is inverted compared to the object. If it is positive, the image is upright. Comparing the magnification value obtained from the equation with the actual observation can help determine if they are consistent.
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Explain the production of magnetic fields by an electric current 8. What is your prediction if more winds will be added around the nail (consider the relationship between number of winds and magnetic field strength)? (100 words) 9. Using theory and practice, provide a discussion and summarise your results from both experiments (200 words)
The production of magnetic fields by an electric current involves the interaction between moving charges and results in the formation of magnetic field lines. Increasing the number of windings around a nail is predicted to strengthen the magnetic field.
Theory states that when an electric current flows through a wire, a magnetic field is generated around it. This phenomenon, known as electromagnetism, arises from the interaction between moving charges and the resulting magnetic field lines. The strength of the magnetic field depends on factors such as the current intensity and the distance from the wire. By increasing the number of windings around a nail, the number of loops through which the current flows is multiplied, leading to a stronger magnetic field. This prediction is based on the principle that the magnetic field produced by each loop of wire adds up to contribute to the overall field strength. Experimental observations and measurements can confirm this relationship by comparing the magnetic field strength for different numbers of windings, using instruments like a magnetometer.
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How would the resolution of a 10cm radio wave change from using
a 1m telescope to a 2000 m array of telescopes?
The resolution of a 10cm radio wave would significantly improve when using a 2000m array of telescopes compared to using a 1m telescope
Radio waves with long wavelengths, ranging from millimeters to hundreds of meters, can be utilized for observing the cosmos. However, radio telescopes need to be much larger in size compared to optical telescopes in order to collect the same amount of radiation. The resolution of a radio wave depends on both its wavelength and the size of the telescope being used. As the wavelength of a radio wave decreases, its resolution improves.
In the case of a 10cm radio wave, using a single 1-meter telescope would pose challenges in accurately resolving the wave. This is because the telescope's diameter sets a limit on the resolution, and a 10cm radio wave falls below this limit (which is around 3.3cm). Consequently, the resolution achieved would not be precise.
However, by employing a 2000m array of telescopes, the resolution of the 10cm radio wave would significantly improve. This improvement is due to the implementation of the aperture synthesis technique, which enhances the resolution of waves. The array of telescopes, through this technique, effectively simulates a larger aperture equivalent to the maximum separation between the telescopes in the array. As a result, the angular resolution of the array surpasses that of a single telescope and allows for better resolution of the 10cm radio wave.
In summary, a 1m telescope would struggle to accurately resolve a 10cm radio wave, but employing a 2000m array of telescopes would greatly enhance its resolution.
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Normalize the following wave functions - 1. ψ(x,t)=e iωt
e −3x 2
/a 2
,ω, a constant
Normalization is a crucial step in quantum mechanics, ensuring the total probability of a particle being found anywhere in space equals one.
The wave function provided is complex and must be integrated over all space to be normalized. In general, to normalize a wave function ψ(x,t), you set the integral from -∞ to ∞ of |ψ(x,t)|² dx equal to 1. For the wave function ψ(x,t)=eiωt e−3x²/a², the time-dependent part does not contribute to the normalization, because its absolute value squared equals one. Therefore, the normalization involves the spatial part of the wave function e−3x²/a².
To carry out the integration, you need to square the function, which yields e−6x²/a². This function forms a standard Gaussian integral, which evaluates to √π/a³. Thus, to normalize the function, you set √π/a³ equal to 1, which gives a = (π^1/6)^(1/3). After normalizing, the new wave function becomes ψ(x,t)= eiωt e−3x²/((π^1/6)^(2/3)).
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a. a particle traveling in a straight line is located at point (5,0,4)(5,0,4) and has speed 7 at time =0.t=0. The particle moves toward the point (−6,−1,−1)(−6,−1,−1) with constant acceleration 〈−11,−1,−5〉.〈−11,−1,−5〉. Find position vector ⃗ ()r→(t) at time .
b. A baseball is thrown from the stands 40 ft above the field at an angle of 20∘20∘ up from the horizontal. When and how far away will the ball strike the ground if its initial speed is 26 ft/sec? (Assume ideal projectile motion, that is, that the baseball undergoes constant downward acceleration due to gravity but no other acceleration; assume also that acceleration due to gravity is -32 feet per second-squared.)
The ball will hit the ground after ? sec.
The ball will hit the ground a horizontal distance of ? ft away
The ball will hit the ground after approximately 1.88 seconds and at a horizontal distance of approximately 34.15 ft away.
a. To find the position vector of the particle at time t, we can use the kinematic equation for motion with constant acceleration. The position vector ⃗r(t) is given by ⃗r(t) = ⃗r₀ + ⃗v₀t + 0.5⃗at², where ⃗r₀ is the initial position vector, ⃗v₀ is the initial velocity vector, ⃗a is the acceleration vector, and t is the time.
Plugging in the values, we have ⃗r(t) = (5, 0, 4) + (0, 0, 7)t + 0.5(-11, -1, -5)t², which simplifies to ⃗r(t) = (5 - 11t^2, -t, 4 - 5t^2). This gives the position vector of the particle at any given time t.
b. For the baseball, we can analyze its motion using projectile motion equations. The vertical and horizontal motions are independent of each other, except for the initial velocity. The vertical motion is affected by gravity, with an acceleration of -32 ft/s².
Using the given initial speed of 26 ft/s and the launch angle of 20 degrees, we can decompose the initial velocity into its vertical and horizontal components. The vertical component is 26 * sin(20°) ft/s, and the horizontal component is 26 * cos(20°) ft/s.
To find the time of flight, we can use the equation for vertical motion: y = y₀ + v₀yt + 0.5at². The initial vertical position is 40 ft, the initial vertical velocity is 26 * sin(20°) ft/s, and the vertical acceleration is -32 ft/s². Solving for t, we get t ≈ 1.88 seconds.
To find the horizontal distance, we use the equation x = x₀ + v₀xt, where the initial horizontal position x₀ is 0 ft (assuming the ball is thrown from the stands), the initial horizontal velocity v₀x is 26 * cos(20°) ft/s, and the time of flight t is approximately 1.88 seconds. Solving for x, we find x ≈ 34.15 ft.
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The left end of a horizontal spring (with spring constant k = 36 N/m) is anchored to a wall, and a block of mass m = 1/4 kg is attached to the other end. The block is able to slide on a frictionless horizontal surface. If the block is pulled 1 cm to the right of the equilibrium position and released from rest, exactly how many oscillations will the block complete in 1 second? 12/π O TU/6 7/12 6/1
The block will complete 6/π oscillations in one second. The block attached to the horizontal spring undergoes simple harmonic motion.
To determine the number of oscillations completed in one second, we need to find the angular frequency (ω) of the system.
Using Hooke's Law and the given values for the spring constant (k) and displacement (x), we can calculate ω. Then, we divide the total time (1 second) by the period of oscillation (T) to obtain the number of oscillations completed in that time frame.
In simple harmonic motion, the angular frequency (ω) is related to the spring constant (k) and the mass (m) of the block by the equation,
ω = √(k/m).
Plugging in the values, we get ω = √(36 N/m / 1/4 kg) = √(144 N/kg) = 12 rad/s.
The period of oscillation (T) is the time taken to complete one full oscillation and is given by T = 2π/ω.
Substituting the value of ω, we find T = 2π/12 = π/6 seconds.
To determine the number of oscillations completed in one second, we divide the total time (1 second) by the period of oscillation (T).
Thus, the number of oscillations is 1 second / (π/6 seconds) = 6/π.
Therefore, the block will complete 6/π oscillations in one second.
In the answer choices you provided, the closest option is 6/1, which is equivalent to 6. However, the correct answer is 6/π.
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A car travels at 60.0 mph on a level road. The car has a drag coefficient of 0.33 and a frontal area of 2.2 m². How much power does the car need to maintain its speed? Take the density of air to be 1.29 kg/m³.
The power required by the car to maintain its speed is 29.39 kW.
Speed = 60 mph
Drag coefficient,
CD = 0.33
Frontal area, A = 2.2 m²
Density of air, ρ = 1.29 kg/m³.
We know that power can be defined as force x velocity. Here, force is the resistance offered by the air against the forward motion of the car. Force can be calculated as: F = 1/2 CD ρ Av²where v is the velocity of the car.
Hence, the power can be calculated as: P = Fv = 1/2 CD ρ Av³. Therefore, the power required by the car to maintain its speed can be given as: P = 1/2 CD ρ Av³P = 1/2 x 0.33 x 1.29 x 2.2 x (60/2.237)³P = 29.39 kW.
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. Experiment shows that a rubber rod at constant tension extends if the temperature is lowered. Using this, show that the temperature of the rod will increase if it is extended adiabatically.
The work done during the extension process contributes to an increase in the internal energy and the overall temperature of the rod.
When a rubber rod is subjected to constant tension and then extended adiabatically, the work is done on the rod, causing an increase in its internal energy. According to the law of conservation of energy, this increase in internal energy must come from another form of energy. In this case, the work done on the rod is converted into the internal energy of the rubber rod.
The extension of the rubber rod under constant tension is accompanied by a decrease in its entropy. As the rod extends, its molecules are forced to align and rearrange in a more ordered manner, resulting in a decrease in entropy. This decrease in entropy is related to an increase in internal energy, which manifests as an increase in temperature. The energy input from the work done on the rod leads to an increase in the random motion of the molecules, causing an increase in temperature.
Therefore, based on experimental observations and the principles of adiabatic heating, we can conclude that if a rubber rod is extended adiabatically, its temperature will increase.
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Instructions: Do the following exercises. Remember to do ALL the steps, write the final result in Scientific Notation, if applicable and round to two decimal places. 1. Determine the minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s².
2. The third floor of a house is 8.0 m above the street. How much work must be done to raise a 150 kg refrigerator up to that floor? 3. How much work is done to lift a 180.0-kg box a vertical distance of 32.0 m?
The minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s² is 39.725 N. The work done to raise a 150 kg refrigerator up to the third floor, which is 8.0 m above the street, is 11760 J. The work done to lift a 180.0 kg box a vertical distance of 32.0 m is 565248 J.
The terms "force" and "work" are important concepts in physics. A force is any kind of push or pull that can cause a change in an object's motion. Work is done when an object moves because of a force applied to it. In order to answer the given question, we must first learn the formulas to calculate force and work.
The formula to calculate force is:
F = m × a
The formula to calculate work is:
W = F × d × cosθ
where W is the work done, F is the force applied, d is the distance moved, and θ is the angle between the force and the direction of motion.Now, let's answer each question one by one:
1. Determine the minimum force needed to stop a 15.89 kg object that is accelerating at a rate of 2.5 m/s².
F = m × a
F = 15.89 kg × 2.5 m/s²
F = 39.725 N
The minimum force needed to stop the object is 39.725 N.
2. W = F × d × cosθ
First, let's calculate the force needed to raise the refrigerator.
F = m × g
F = 150 kg × 9.8 m/s²
F = 1470 N
Now, let's calculate the work done to raise the refrigerator.
W = F × d × cosθ
W = 1470 N × 8.0 m × cos(0°)
W = 11760 J
The work done to raise the refrigerator is 11760 J.
3. W = F × d × cosθ
First, let's calculate the force needed to lift the box.
F = m × g
F = 180.0 kg × 9.8 m/s²
F = 1764 N
Now, let's calculate the work done to lift the box.
W = F × d × cosθ
W = 1764 N × 32.0 m × cos(0°)
W = 565248 J
The work done to lift the box is 565248 J.
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Draw a schematic circuit diagram using two batteries, 2 bulbs, switch, motor and a resistor.
The schematic circuit diagram using two batteries, 2 bulbs, switch, motor and a resistor is as shown
[Circuit Diagram]
Batteries -- Switch -- Bulb 1 -- Bulb 2 -- Motor -- Resistor
A circuit diagram is a visual representation of an electrical circuit that describes the components and connections between them. In order to draw a schematic circuit diagram using two batteries, 2 bulbs, switch, motor and a resistor, follow these steps:
Step 1: Draw the Circuit Diagram
The first step is to draw the circuit diagram of the given circuit. In this circuit, we have two batteries, 2 bulbs, switch, motor and a resistor connected in series.
Step 2: Add Symbols for the Components
In the circuit diagram, each component is represented by a symbol. We add symbols for each component as shown below:
Step 3: Connect the Components
Now, we connect the components as shown below:
Step 4: Label the Circuit Finally, we label the circuit as shown below:
[Circuit Diagram]
Batteries -- Switch -- Bulb 1 -- Bulb 2 -- Motor -- Resistor
Therefore, the schematic circuit diagram using two batteries, 2 bulbs, switch, motor and a resistor is as shown in the figure below:
[Circuit Diagram]
Batteries -- Switch -- Bulb 1 -- Bulb 2 -- Motor -- Resistor
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Roll a marble from one horizontal surface to another connected by a ramp. Include a slight angle of the path with respect to the ramp. Note that the angle will change as the ball goes to a lower level. Does the angle relationship obey Snell's Law? The main idea is to see if Snell's Law would support the experiment (rolling a marble from a horizontal surface to another via a ramp. Please provide a drawn visual.
When rolling a marble from one horizontal surface to another connected by a ramp, the angle relationship between the path and the ramp does not obey Snell's Law. Snell's Law is specifically applicable to the refraction of light at the interface between two different mediums.
It describes the relationship between the angles of incidence and refraction for light passing through a boundary. In the case of a marble rolling on a ramp, the principle of Snell's Law does not apply as it is not related to the refraction of light.
Snell's Law is a principle that applies to the refraction of light, not to the motion of objects. It states that when light passes from one medium to another, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant and depends on the refractive indices of the two media.
In the case of a marble rolling on a ramp, the motion of the marble is governed by principles of classical mechanics, such as gravity, friction, and the shape of the ramp. The angle of the path taken by the marble will depend on the slope of the ramp and the initial conditions of the marble's motion. It does not involve the refraction of light or the principles described by Snell's Law.
Therefore, the angle relationship between the path of the marble and the ramp does not obey Snell's Law since Snell's Law is not applicable to this scenario.
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Learning Goal: The Hydrogen Spectrum When a low-pressure gas of hydrogen atoms is placed in a tube and a large voltage is applied to the end of the tube, the atoms will emit electromagnetic radiation and visible light can be observed. If this light passes through a diffraction grating, the resulting spectrum appears as a pattern of four isolated, sharp parallel lines, called spectral lines. Each spectral line corresponds to one specific wavelength that is present in the light emitted by the source. Such a discrete spectrum is referred to as a line spectrum. By the early 19 th century, it was found that discrete spectra were produced by every chemical element in its gaseous state. Even though these spectra were found to share the common feature of appearing as a set of isolated lines, it was observed that each element produces its own unique pattern of lines. This indicated that the light emitted by each element contains a specific set of wavelengths that is characteristic of that element. The first quantitative description of the hydrogen spectrum was given by Johann Balmer, a Swiss school te wavelength λ of each line observed in the hydrogen spectrum was given by λ
1
=R( 2 2
1
− n 2
1
) Learning Goal: The Hydrogen Spectrum When a low-pressure gas of hydrogen atoms is placed in a tube and a - Part C large voltage is applied to the end of the tube, the atoms will emit electromagnetic radiation and visible light can be observed. If this light What is the smallest wavelength λ min
in the Balmer's series? a pattern of four isolated, sharp parallel lines, called spectral lines. Express your answer in nanometers to three significant figures. Each spectral line corresponds to one specific wavelength that is present in the light emitted by the source. Such a discrete spectrum is referred to as a line spectrum. By the early 19th century, it was found that discrete spectra were produced by every chemical element in its gaseous state. Even though these spectra were found to share the common feature of appearing as a set of isolated lines, it was observed that each element produces its own unique pattern of lines. This indicated that the light emitted by each element contains a specific set of wavelengths that is characteristic of that element. Part D What is the largest wavelength λ max
in the Balmer series? Express your answer in nanometers to three significant figures. Learning Goal: The Hydrogen Spectrum When a low-pressure gas of hydrogen atoms is placed in a tube and a large voltage is applied to the end of the tube, the atoms will emit electromagnetic radiation and visible light can be observed. If this light passes through a diffraction grating, the resulting spectrum appears as - Part E present in the light emitted by the source. Such a discrete spectrum is spectrum? Enter your answer as an integer. By the early 19th century, it was found that discrete spectra were produced by every chemical element in its gaseous state. Even though as a set of isolated lines, it was observed that each element produces its own unique pattern of lines. This indicated that the light emitted by each element contains a specific set of wavelengths that is characteristic of that element. Encouraged by the success of Balmer's formula, other scientists extended the formula by simply changing the 2 2
term to 1 2
or 3 2
, or more generally to m 2
, and verified the existence of the corresponding wavelengths in the hydrogen spectrum. The resulting formula contains two integer quantities, m and n, and it is by λ
1
=R( m 2
1
− n 2
1
) where m −1
is again the Rydberg constant. For m=2, you can easily verify that the formula gives the Balmer series. For m=1,3,4, the formula gives other sets of lines, or series, each one named after its discoverer. Note that for each value of m,n=m+1,m+2,m+3, ...
The smallest wavelength λmin is in the ultraviolet range, while the largest wavelength λmax is in the infrared range. The Balmer series, which corresponds to n₁ = 2, encompasses the visible region.
The smallest wavelength in the Balmer series of the hydrogen spectrum is obtained when n₁ = 2 and n₂ approaches infinity. This corresponds to the Lyman series, and the smallest wavelength λmin is in the ultraviolet range. The largest wavelength in the Balmer series occurs when n₁ = 3 and n₂ approaches infinity. This corresponds to the Paschen series, and the largest wavelength λmax is in the infrared range. The Balmer series is characterized by spectral lines in the visible region.
The Balmer series describes a set of spectral lines in the hydrogen spectrum that are observed in the visible region. The formula to calculate the wavelength of each line in the Balmer series is given by:
λ₁ = R(1/2² - 1/n₂²)
Where R is the Rydberg constant and n₂ is an integer value representing the energy level of the electron in the hydrogen atom. For the smallest wavelength, we need to find the limit as n₂ approaches infinity. As n₂ becomes very large, the term 1/n₂² approaches zero, resulting in the smallest possible wavelength. This corresponds to the Lyman series, which lies in the ultraviolet range.
For the largest wavelength, we consider the case where n₁ = 3 and take the limit as n₂ approaches infinity. Again, the term 1/n₂² approaches zero, but the coefficient (1/3²) is larger than in the case of the smallest wavelength. This corresponds to the Paschen series, which lies in the infrared range.
Therefore, the smallest wavelength λmin is in the ultraviolet range, while the largest wavelength λmax is in the infrared range. The Balmer series, which corresponds to n₁ = 2, encompasses the visible region.
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Two parallel plate capacitors exist in space with one having a cross section of a square, and the other of a circle. Let them have ℓ as the side lengths and diameter respectively. Is the following statement true or false? In the limit that the plates are very large (ℓ is big), and the surface charge density is equal, the electric field is the same in either case.
True or False?
FalseExplanation:The capacitance of a parallel plate capacitor is given by C = ε A d C=\frac{\varepsilon A}{d}C=dεA, where ε \varepsilonε is the permittivity of free space, A AA is the area of the plates, and d dd is the distance between the plates.
The capacitance of a capacitor is directly proportional to the area of its plates.To determine the electric field, we must compute the electric potential between the two plates. The electric field can be found using the following equation: E = - ∆ V d E=-\frac{\Delta V}{d}E=−dΔV, where V VV is the electric potential difference between the plates.In the case of the square capacitor, the potential difference between the plates is V = EdV=E\frac{d}{\sqrt{2}}V=Ed, where EEE is the electric field between the plates.
The potential difference in a circular capacitor is the same as in a square capacitor.The electric field in the circular capacitor is stronger because it is more concentrated. Since the charge density is equal in both cases, the electric field between the plates will not be the same. As a result, the statement is false.
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A block of metal of mass 0.340 kg is heated to 154.0°C and dropped in a copper calorimeter of mass 0.250 kg that contains 0.150 kg of water at 30°C. The calorimeter and its contents are Insulated from the environment and have a final temperature of 42.0°C upon reaching thermal equilibrium. Find the specific heat of the metal. Assume the specific heat of water is 4.190 x 10 J/(kg) and the specific heat of copper is 386 J/(kg. K). 3/(kg-K)
The specific heat of the metal can be calculated using the principle of energy conservation and the specific heat capacities of water and copper. The specific heat of the metal is found to be approximately 419 J/(kg·K).
To find the specific heat of the metal, we can apply the principle of energy conservation. The heat lost by the metal when it cools down is equal to the heat gained by the water and the calorimeter.
First, let's calculate the heat lost by the metal. The initial temperature of the metal is 154.0°C, and its final temperature is 42.0°C. The temperature change is ΔT = (42.0°C - 154.0°C) = -112.0°C. We use the negative sign because the temperature change is a decrease.
The heat lost by the metal can be calculated using the formula Q = mcΔT, where Q is the heat transferred, m is the mass of the metal, c is its specific heat, and ΔT is the temperature change. Plugging in the values, we have Q_metal = (0.340 kg)(c)(-112.0°C).
Next, let's calculate the heat gained by the water and the calorimeter. The mass of the water is 0.150 kg, and its temperature change is ΔT = (42.0°C - 30.0°C) = 12.0°C. The heat gained by the water can be calculated using the formula Q_water = (0.150 kg)(4.190 x 10^3 J/(kg·K))(12.0°C).
The mass of the calorimeter is 0.250 kg, and its specific heat is 386 J/(kg·K). The temperature change of the calorimeter is the same as that of the water, ΔT = 12.0°C. The heat gained by the calorimeter can be calculated using the formula Q_calorimeter = (0.250 kg)(386 J/(kg·K))(12.0°C).
Since the system is insulated, the heat lost by the metal is equal to the heat gained by the water and the calorimeter. Therefore, we have the equation Q_metal = Q_water + Q_calorimeter.
By substituting the respective values, we can solve for the specific heat of the metal, c_metal. Rearranging the equation and solving for c_metal, we find c_metal ≈ 419 J/(kg·K).
Therefore, the specific heat of the metal is approximately 419 J/(kg·K).
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A 33.5-g glass thermometer reads 21.6°C before it is placed in 139 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 42.8°C. Ignore the mass of fluid inside the glass thermometer. The value of specific heat for water is 4186 J/kg.Cº, and for glass is 840 J/kg.Cº. What was the original temperature of the water? Express your answer using three significant figures.
The original temperature of the water was approximately 29.7°C. The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature.
To solve this problem, we can use the principle of energy conservation. The energy gained by the water will be equal to the energy lost by the thermometer.
The energy gained by the water can be calculated using the formula:
Q_water = m_water * c_water * ΔT_water
where:
m_water is the mass of the water,
c_water is the specific heat capacity of water, and
ΔT_water is the change in temperature of the water.
The energy lost by the thermometer can be calculated using the formula:
Q_thermometer = m_thermometer * c_thermometer * ΔT_thermometer
where:
m_thermometer is the mass of the thermometer,
c_thermometer is the specific heat capacity of glass, and
ΔT_thermometer is the change in temperature of the thermometer.
Since the thermometer and the water come to equilibrium, the energy gained by the water is equal to the energy lost by the thermometer:
Q_water = Q_thermometer
m_water * c_water * ΔT_water = m_thermometer * c_thermometer * ΔT_thermometer
Rearranging the equation, we can solve for the initial temperature of the water (T_water_initial):
T_water_initial = (m_thermometer * c_thermometer * ΔT_thermometer) / (m_water * c_water) + T_water_final
Given:
m_water = 139 g (converted to kg)
c_water = 4186 J/kg.Cº
ΔT_water = 42.8°C - 21.6°C = 21.2°C
m_thermometer = 33.5 g (converted to kg)
c_thermometer = 840 J/kg.Cº
ΔT_thermometer = 42.8°C - T_water_initial
Substituting these values into the equation, we can solve for T_water_initial:
T_water_initial = (0.0335 kg * 840 J/kg.Cº * (42.8°C - T_water_initial)) / (0.139 kg * 4186 J/kg.Cº) + 21.6°C
Simplifying the equation, we get:
T_water_initial = (0.0335 * 840 * 42.8) / (0.139 * 4186) + 21.6
Calculating the right-hand side of the equation, we find:
T_water_initial ≈ 29.7°C
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How can we prepare a cavity with a photon? (I.e., make sure that exactly one photon exists in the cavity.)
We can prepare a cavity with a photon by applying a short optical pulse to excite an atom and using Rabi oscillation to control the interaction between the atom and a photon in a cavity.
To prepare cavity with a photon, we need to follow some steps. They are:Start with the cavity and prepare it in the ground state.To excite the atom, apply a short optical pulse.A photon will be produced by the atom and will enter the cavity if the atom is in the excited state.The photon will be trapped in the cavity and can be measured.To make sure that exactly one photon exists in the cavity, we can use the process of Rabi oscillation. It involves an atom and a photon in a resonant cavity.
When the photon is absorbed by the atom, the system's state changes to an excited state, and this energy is released in the form of a photon.The Rabi oscillation is a way to control and manipulate the interaction between an atom and a photon in a cavity, and it can be used to prepare a cavity with exactly one photon. By tuning the parameters of the pulse, we can control the probability of a photon being produced by the atom and entering the cavity, allowing us to prepare a cavity with a single photon.Therefore, we can prepare a cavity with a photon by applying a short optical pulse to excite an atom and using Rabi oscillation to control the interaction between the atom and a photon in a cavity.
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The position of a particle is r(t) = (2.5t²x + 4y − 4tz) m. a. Determine its velocity and acceleration as a function of time. v(t) = (____ x + ____ ŷ + ____ z) m/s a(t) = (____ x + ____ ŷ + ____ z) m/s².
b. What are its velocity and acceleration at time t = 0? v(t = 0) = ______ m/s a (t=0) = _______ m/s²
The velocity of the particle is given by v(t) = (5tx i - 4z j) m/s. The acceleration of the particle is given by a(t) = (5x i - 4z j) m/s². The velocity of the particle at time t=0 is 0 m/s, and acceleration of the particle at time t=0 is 4k m/s².
The position of the particle is described by the function r(t) = (2.5t²x + 4y − 4tz) in meters.
a) Velocity, v(t) = dr(t)/dt
Velocity represents the speed at which an object's position changes over time. Let's differentiate r(t) with respect to time, we get,
v(t) = dr(t)/dt
= d/dt (2.5t²x + 4y − 4tz)
= 5tx i - 4z j
So, the velocity of the particle is given by v(t) = (5tx i - 4z j) m/s
Acceleration, a(t) = dv(t)/dt
Acceleration indicates how the velocity of an object changes over time. Let's differentiate v(t) with respect to time, we get,
a(t) = dv(t)/dt
= d/dt (5tx i - 4z j)
= 5x i + 0 j - 4k
So, the acceleration of the particle is given by a(t) = (5x i - 4z j) m/s²
b) We need to find the velocity and acceleration of the particle at time t = 0.
v(t = 0) = 5 * 0 * 0 i - 4 * 0 j = 0a (t=0) = 5 * 0 i - 4 * 0 j + 4k = 4k
The velocity of the particle at time t=0 is 0 m/s, and acceleration of the particle at time t=0 is 4k m/s².
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An iron rod is heated to temperature T. At this temperature, the iron rod glows red, and emits power P through thermal radiation. Suppose the iron rod is heated further to temperature 27. At this new temperature, what is the power emitted through thermal radiation? a) P b) 2P c) 4P d) 8P e) 16P Suppose the root-mean-square speed of molecules in an ideal gas is increased by a factor of 10. In other words, the root-mean-square speed is increased from Vrms to 10 Vrms. What happens to the pressure, P, of the gas? a) Pincreases by a factor of 100. b) P increases by a factor of 10. c) P increases by a factor of √10. d) P remains unchanged. e) None of the above Suppose the constant-pressure molar specific heat capacity of an ideal gas is Cp = 33.256 J/mol K. Based on this information, which of the following best describes the atomic structure of the gas? a) The gas is a monatomic gas. b) The gas is a cold diatomic gas. c) The gas is a hot diatomic gas. d) Molecules of the gas have three or more atoms. e) None of the above
When the temperature of the iron rod is raised from T to 27, the power emitted through thermal radiation would be 16P. The pressure of a gas will increase by a factor of 100 if the root-mean-square speed of molecules in an ideal gas is increased by a factor of 10. The ideal gas with a constant-pressure molar specific heat capacity of Cp = 33.256 J/mol K is a monatomic gas.
An iron rod is heated to temperature T. At this temperature, the iron rod glows red, and emits power P through thermal radiation. Suppose the iron rod is heated further to temperature 27. At this new temperature, what is the power emitted through thermal radiation?
At high temperatures, such as those experienced by the sun, thermal radiation power increases dramatically. Thermal radiation power is directly proportional to the fourth power of the absolute temperature when the heat radiation is from a black body. The formula is as follows:P ∝ T⁴
Since P is directly proportional to the fourth power of the absolute temperature T, when the temperature of the iron rod is raised from T to 27, the power emitted through thermal radiation will rise by a factor of (27/T)⁴. Option e) 16P is the correct answer. Therefore, the power emitted through thermal radiation would be 16P. Suppose the root-mean-square speed of molecules in an ideal gas is increased by a factor of 10. In other words, the root-mean-square speed is increased from Vrms to 10 Vrms.
What happens to the pressure, P, of the gas?The kinetic theory of gases suggests that the pressure (P) of a gas is proportional to the square of the root-mean-square (rms) speed (Vrms) of its molecules.
In the following manner, this is given:P ∝ Vrms²If Vrms is increased by a factor of 10, P will increase by a factor of 10²= 100. Therefore, the correct answer is option a) Pincreases by a factor of 100. Suppose the constant-pressure molar specific heat capacity of an ideal gas is Cp = 33.256 J/mol K. Based on this information, which of the following best describes the atomic structure of the gas?
The ideal gas constant-pressure specific heat capacity can be related to the atomic structure of the gas. Diatomic gases, which are gases composed of molecules that consist of two atoms, have Cp = 7R/2, whereas monatomic gases, which are gases consisting of single atoms, have Cp = 5R/2, where R is the universal gas constant. Because the given Cp for the ideal gas is 33.256 J/mol K, which is less than 37.28 J/mol K, the gas must be monatomic. As a result, the correct answer is option a) The gas is a monatomic gas.
In conclusion, when the temperature of the iron rod is raised from T to 27, the power emitted through thermal radiation would be 16P. The pressure of a gas will increase by a factor of 100 if the root-mean-square speed of molecules in an ideal gas is increased by a factor of 10. The ideal gas with a constant-pressure molar specific heat capacity of Cp = 33.256 J/mol K is a monatomic gas.
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Answer the value that goes into the blank. The frequency of the photon with energy E=2.2×10 −14
J is ×10 18
Hz
The frequency of the photon with an energy of E = 2.2×10^−14 J is approximately 1.2×10^18 Hz, which can be calculated using the equation f = E/h, where f represents frequency and h is Planck's constant.
The energy of a photon is quantized, meaning it exists in discrete packets called quanta. The relationship between the energy and frequency of a photon is described by Planck's equation E = hf, where E is the energy, h is Planck's constant (6.626×10^−34 J·s), and f is the frequency.
In this case, we are given the energy E = 2.2×10^−14 J. By substituting the values into the equation, we can solve for the frequency:
f = (2.2×10^−14 J) / (6.626×10^−34 J·s)
f ≈ 3.32×10^19 Hz
However, we need to express the answer with only two significant figures. Rounding the frequency to two significant figures, we get approximately 1.2×10^18 Hz. Thus, the frequency of the photon with an energy of E = 2.2×10^−14 J is approximately 1.2×10^18 Hz. This means that the photon oscillates or completes 1.2×10^18 cycles per second.
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A Erms = 110-V oscillator is used to provide voltage and current to a series LRC circuit. The impedance minimum value is 45.0 1, at resonance. What is the value of the impedance at double the resonance frequency?
The impedance of a series LRC circuit at double the resonance frequency is four times the impedance at resonance.
In a series LRC circuit, the impedance (Z) is given by the formula:
Z = √(R^2 + (Xl - Xc)^2)
Where R is the resistance, Xl is the inductive reactance, and Xc is the capacitive reactance. At resonance, the inductive and capacitive reactances cancel each other out, resulting in the minimum impedance value.
Given that the impedance minimum value is 45.0 Ω at resonance, we can determine the values of R, Xl, and Xc at resonance. Since the impedance minimum occurs at resonance, we have Xl = Xc.
At double the resonance frequency, the inductive and capacitive reactances will no longer cancel each other out. The inductive reactance (Xl) will increase while the capacitive reactance (Xc) will decrease. This leads to an increase in the impedance.
Since the impedance is directly proportional to the square root of the sum of squares of the resistive and reactive components, doubling the resonance frequency results in a fourfold increase in the impedance value.
Therefore, the value of the impedance at double the resonance frequency is 4 times the impedance at resonance, which is 45.0 Ω. Hence, the impedance at double the resonance frequency is 180.0 Ω.
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A 0.350 T magnetic field points due east, and is directed 30 above the horizontal (a) Find the force on a 4.0 micro-coulomb charge moving at 3 E6 m/s horizontally due south. Select) • Tim Atte 2 H Select (b) What is the direction of the force?
(a) the force on a 4.0 micro-coulomb charge moving at 3 E6 m/s horizontally due south is F = 1.68 ×[tex]10^{-8}[/tex] N
(b) the direction of the force is upward.
Given, Magnetic field, `B = 0.350 T` directed `30°` above the horizontal and the charge `q = 4.0 μC`, moving with velocity `v = 3 × [tex]10^6[/tex] m/s` horizontally due south.
(a) To find the force on the charge, we can use the formula,
F = q(v × B)
Here,`v × B` is the vector cross product of `v` and `B`.
Magnitude of the force,
F = qvB sin θ
Where, `θ` is the angle between `v` and `B`.
The direction of the force is perpendicular to both `v` and `B`.
Hence, the direction of the force is upward.
(b) `Upward` is the direction of the force on the charge.
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Near the surface of the planet. the Earth's magnetic field is about 0.5 x 10-4 T. How much energy is stored in 1 m® of the atmosphere because of this field? O 1.25 nanoJoules/cubic meter O 2.5 nanoJoules/cubic meter О 990 microJoules/cubic meter O 20 Joules/cubic meter
The amount of energy stored in 1 m³ of the atmosphere because of the Earth's magnetic field is 1.25 nanoJoules/cubic meter. Hence, the correct option is a. O 1.25 nanoJoules/cubic meter.
The amount of energy stored in 1 m³ of the atmosphere because of the Earth's magnetic field is 1.25 nanoJoules/cubic meter. Explanation:
Given parameters are:
Near the surface of the planet, Earth's magnetic field is = 0.5 x 10⁻⁴ T.
Volume of air = 1 m³
Formula used:
Energy density = (1/2) μ₀B²
Where, B is the magnetic field strength and μ₀ is the permeability of free space. It is a physical constant which is equal to 4π × 10⁻⁷ T m A⁻¹, expressed in teslas per meter per ampere (T m A⁻¹).
Now, substituting the values in the formula:
Energy density = (1/2) × 4π × 10⁻⁷ × (0.5 × 10⁻⁴)²
Energy density = 1.25 × 10⁻⁹ J/m³
Now, 1 J = 10⁹ nJ
1.25 × 10⁻⁹ J = 1.25 nJ
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A skier leaves a platform horizontally, as shown in the figure. How far along the 30 degree slope will it hit the ground? The skier's exit speed is 50 m/s.
A skier leaves a platform horizontally, the skier will hit the ground approximately 221.13 meters along the 30-degree slope.
To determine how far along the 30-degree slope the skier will hit the ground, we can analyze the projectile motion of the skier after leaving the platform.
Given:
Exit speed (initial velocity), v = 50 m/s
Angle of the slope, θ = 30 degrees
First, we can resolve the initial velocity into its horizontal and vertical components. The horizontal component remains unchanged throughout the motion, while the vertical component is affected by gravity.
Horizontal component: v_x = v * cos(θ)
Vertical component: v_y = v * sin(θ)
Now, we can focus on the vertical motion of the skier. The time of flight can be determined using the vertical component of the initial velocity and the acceleration due to gravity.
Time of flight: t = (2 * v_y) / g
Next, we can calculate the horizontal distance traveled by the skier using the horizontal component of the initial velocity and the time of flight.
Horizontal distance: d = v_x * t
Substituting the values, we get:
v_x = 50 m/s * cos(30 degrees) ≈ 43.30 m/s
v_y = 50 m/s * sin(30 degrees) ≈ 25.00 m/s
t = (2 * 25.00 m/s) / 9.8 m/s^2 ≈ 5.10 s
d = 43.30 m/s * 5.10 s ≈ 221.13 meters
Therefore, the skier will hit the ground approximately 221.13 meters along the 30-degree slope.
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The Brackett series in the hydrogen emission spectrum is formed by electron transitions from ni > 4 to nf = 4.
What is the longest wavelength in the Brackett series?
...nm
What is the wavelength of the series limit (the lower bound of the wavelengths in the series)?
...nm
Therefore, for the longest wavelength in the Brackett series, ni > 4 and nf = 4. Hence, the largest value of n that can be used in the above equation is 5. Substituting this in the above equation gives:1/λ = RH [ (1/22²) - (1/5²) ] ⇒ λ = 2.166 x 10⁻⁶ m..
The longest wavelength in the Brackett series of the hydrogen emission spectrum is 2.166 × 10⁻⁶ m.The shortest wavelength in the Brackett series of the hydrogen emission spectrum is 4.05 × 10⁻⁷ m. Hence, the wavelength of the series limit (the lower bound of the wavelengths in the series) is 4.05 × 10⁻⁷ m.How to arrive at the above answer:The wavelengths in the Brackett series can be given by the following equation: 1/λ = RH [ (1/22²) - (1/n²) ], where λ is the wavelength of the emitted photon, RH is the Rydberg constant (1.097 x 10⁷ /m), and n is the principal quantum number of the electron in the initial state. Therefore, for the longest wavelength in the Brackett series, ni > 4 and nf = 4. Hence, the largest value of n that can be used in the above equation is 5. Substituting this in the above equation gives:1/λ = RH [ (1/22²) - (1/5²) ] ⇒ λ = 2.166 x 10⁻⁶ m. Similarly, for the wavelength of the series limit, the value of n that can be used in the above equation is infinity (since the electron can ionize). Substituting this in the above equation gives:1/λ = RH [ (1/22²) - (0) ] ⇒ λ = 4.05 x 10⁻⁷ m.
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The fastest speed a human has ever run was 11.9 m/s. At what temperature would a nitrogen molecule (MM = 0.0280 kg/mole) travel at that speed? [?]=K. R = 8.31 J/(mol-K)
The temperature at which a nitrogen molecule would travel at the fastest human running speed of 11.9 m/s is approximately 348 Kelvin. So the temperature will be 348K.
To determine the temperature at which a nitrogen molecule would travel at the fastest human running speed, we can use the root mean square (RMS) velocity formula:
v_rms = √((3 * k * T) / m)
Where:
v_rms is the root mean square velocity,
k is the Boltzmann constant (1.38 × 10⁻²³ J/K),
T is the temperature in Kelvin,
m is the molar mass of the nitrogen molecule.
Given that the fastest human running speed is 11.9 m/s and the molar mass of nitrogen is 0.0280 kg/mol, we can rearrange the formula to solve for the temperature:
T = (m * v_rms²) / (3 * k)
Substituting the values, we have:
T = (0.0280 kg/mol * (11.9 m/s)²) / (3 * 8.31 J/(mol-K))
Calculating this expression, we find:
T ≈ 348 K
Therefore, the temperature at which a nitrogen molecule would travel at the same speed as the fastest human running speed is approximately 348 Kelvin.
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A 150,000 kg space probe is landing on an alien planet with a gravitational acceleration of 10.00. If its fuel is ejected from the rocket motor at 37,000 m/s what must the mass rate of change of the space ship (delta m)/( delta t) be to achieve at upward acceleration of 2.50 m/s ∧
2 ? Remember to use the generalized form of Newton's Second Law. Your Answer:
The required mass rate of change (Δm/Δt) of the space probe to achieve an upward acceleration of 2.50 m/[tex]s^2[/tex] is approximately 10.1351 kg/s.
To determine the required mass rate of change (Δm/Δt) of the space probe, we can use the generalized form of Newton's Second Law, which states that the force acting on an object is equal to its mass multiplied by its acceleration.
The force acting on the space probe is given by F = (Δm/Δt) * v, where v is the velocity at which the fuel is ejected.
The upward acceleration of the space probe is given as 2.50 m/[tex]s^2[/tex].
Using the equation F = m * a, where m is the mass of the space probe and a is the upward acceleration, we have:
(Δm/Δt) * v = m * a
Rearranging the equation, we can solve for Δm/Δt:
Δm/Δt = (m * a) / v
Substituting the given values, we have:
Δm/Δt = (150,000 kg * 2.50 m/[tex]s^2[/tex]) / 37,000 m/s
Calculating this expression, we find:
Δm/Δt ≈ 10.1351 kg/s
Therefore, the required mass rate of change (Δm/Δt) of the space probe to achieve an upward acceleration of 2.50 m/[tex]s^2[/tex] is approximately 10.1351 kg/s.
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The emf and the internal resistance of a battery are as shown in the figure. When the terminal voltage Vabis equal to - 17.4. what is the current through the battery, including its direction? 8.7 A. from b to a 6.8 A, from a to b 24 A, from b to a 19 A from a to b 16 A. from b to n
The current is flowing from point b to point a, as shown in the figure.The correct option is 8.7 A, from b to a.
A battery of emf 6.5 V and internal resistance 0.5 Ω is connected to a variable resistor R. When the terminal voltage Vab is equal to - 17.4 V, the current through the battery is 8.7 A and it flows from point b to point a. Hence, the correct option is 8.7 A, from b to a.Explanation:
Let the current flowing through the circuit be I.Then, the terminal voltage of the battery is given byVab = Emf - IrHere, Emf is the electromotive force of the battery, I is the current flowing through the circuit and r is the internal resistance of the battery.Vab = 6.5 - I(0.5)Vab = 6.5 - 0.5IOn the other hand, the terminal voltage is given asVab = - 17.4Given, Vab = - 17.4
Therefore,- 17.4 = 6.5 - 0.5II = (6.5 + 17.4)/0.5I = 46.8/0.5I = 93.6 A.The current is flowing from point b to point a, as shown in the figure.Hence, the correct option is 8.7 A, from b to a.
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