The efficiency of generator when 7.0 tons of coal are burned to generate 3.6 x 10^4 kwh of electricity is 74.1%.
The efficiency of the generator is the ratio of the useful output of energy to the input of energy. It is a measure of how much of the energy that is put into a system actually gets transformed into useful output energy.
To calculate the efficiency, we need to determine the useful energy output and the energy input. Then we can find the efficiency by dividing the useful energy output by the energy input.
Given that 7.0 tons of coal are burned to generate 3.6 x 10^4 kwh of electricity.
Here, we have to find the efficiency of the generator.
We need to convert the given tons of coal into joules.
1 ton of coal = 2.5 x 10^10 J
So,7.0 tons of coal = 7.0 x 2.5 x 10^10 J = 1.75 x 10^11 J
The input energy is 1.75 x 10^11 J
Useful output energy is given as 3.6 x 10^4 kWh.
We need to convert kWh into joules.
1 kWh = 3.6 x 10^6 J
Therefore, 3.6 x 10^4 kWh = 3.6 x 10^4 x 3.6 x 10^6 J = 1.296 x 10^11 J
The efficiency of the generator is given as
Efficiency = (Useful output energy / Input energy) x 100
Substituting the values, we get,
Efficiency= (1.296 x 10^11 / 1.75 x 10^11) x 100= 0.741 x 100= 74.1%
Therefore, the efficiency of the generator is 74.1%.
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you fire a 250-g arrow at a 2.5-kg box resting on the table. the box slides 1.34 meters across the table before it stops. the coefficient of kinetic friction between the box and the table is 0.30. how much energy did friction dissipate? at what velocity is the arrow/box moving right after the collision? what was the initial arrow's speed right before it hit the box?
The friction dissipated 9.82 J of energy, the velocity of the arrow/box system right after the collision is 1.12 m/s to the right, and the initial velocity of the arrow was 11.2 m/s to the right.
To solve this problem, we'll use the conservation of momentum and the work-energy principle.
First, let's find the initial velocity of the arrow before it hits the box. We can use the conservation of momentum equation:
m1v1 = (m1 + m2)vf
where m1 is the mass of the arrow,
v1 is the initial velocity of the arrow,
m2 is the mass of the box,
and vf is the final velocity of the arrow and box system after the collision.
Plugging in the values we get:
(0.25 kg)(v1) = (0.25 kg + 2.5 kg)(vf)
Solving for v1, we get:
v1 = 10vf
Next, we need to find the velocity of the arrow/box system after the collision.
We can use the work-energy principle:
W friction = ΔK
where W friction is the work done by friction and ΔK is the change in kinetic energy of the arrow/box system.
Since the arrow and box start at rest, the initial kinetic energy is zero.
The work done by friction is:
W friction = f friction x d
where f friction is the force of friction and d is the distance the box slides.
The force of friction is:
ffriction = μk x Fn
where μk is the coefficient of kinetic friction and Fn is the normal force. Since the box is on a horizontal surface, the normal force is equal to the weight of the box:
Fn = m2g
where g is the acceleration due to gravity.
Plugging in the values we get:
[tex]f friction = (0.30)(2.5 kg)(9.81 m/s^2) = 7.34 N[/tex]
Now we can find the work done by friction:
W friction = (7.34 N)(1.34 m) = 9.82 J
The change in kinetic energy is:
Δ[tex]K = (1/2)(m1 + m2)vf^2 - 0[/tex]
where vf is the final velocity of the arrow and box system after the collision.
Plugging in the values we get:
Δ[tex]K = (1/2)(0.25 kg + 2.5 kg)vf^2[/tex]
Setting W friction equal to ΔK and solving for vf, we get:
vf = [tex]\sqrt{(2Wfriction/(m1+m2))}[/tex]
[tex]\sqrt{ (2(9.82 J)/(0.25 kg + 2.5 kg)) }[/tex]
= 1.12 m/s
Finally, we can find the initial velocity of the arrow:
v1 = 10vf
= 10(1.12 m/s)
= 11.2 m/s.
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a car is approaching a radio station at a speed of 25.0 m/s. if the radio station broadcasts at a frequency of 74.5 mhz, what change in frequency does the driver observe?
The change in frequency observed by the driver when the car is approaching a radio station at a speed of 25.0 m/s broadcasting at a frequency of 74.5 MHz is 74.59 MHz.
The formula for finding the observed frequency when the source is moving towards the observer is given by;
f′=f (v±v0/c)
Where, f is the frequency of the source, v is the velocity of light, v0 is the velocity of the source observed by the observer, c is the speed of light.
In this case, given that, v0 = 25.0 m/sf = 74.5 MHz, v = 3.0 x 108 m/s, c = 3.0 x 108 m/s
Putting the values in the formula, we get,
f′=74.5×(3.0×10^8+25.0×1000/3.0×10^8)=74.59 MHz (approx)
Hence, the change in frequency observed by the driver when the car is 74.59 MHz (approx).
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items If you take snapshots of a standing wave on a string, there are certain instants when the string is totally flat v Part A What has happened to the energy of the wave at those instants? The energy is transformed into the potential energy of the string The energy is transformed into the kinetic energy of the string except of the nodes The energy is transformed into the energy of sound waves in the alt Sub Rouest Answer Provide Food
At those instants, the energy of the wave has been transformed into the potential energy of the string.
This is because, during the wave's motion, the peaks and troughs move towards equilibrium. As they move, they store energy in the form of elastic potential energy, which is the energy stored in the string due to its stretching. When the wave is totally flat, the wave has reached equilibrium and the stored energy has been converted into potential energy. This is why the string appears flat at those instants.
The energy is not transformed into the kinetic energy of the string or the energy of sound waves. The nodes of the wave, where the string is flat, are points at which the wave's kinetic energy is zero, and the energy of sound waves is not produced by standing waves.
In conclusion, when a snapshot is taken of a standing wave on a string at certain instants, the energy of the wave is transformed into the potential energy of the string.
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a spring, stiffness constant, ks hangs vertically from a fixed support. you attach a block of mass m to the spring and lower it very slowly until it hangs freely from the spring, which has an extension, s. The block is the system. Acceleration due to gravity is g downward. Ignore air resistance. Explain your answer in each questionsWhat is the work, Ws done by the spring ?a. -(mg)2/(2ks)b. +(mg)2/(2ks)c. -(mg)2/(ks)d. +(mg)2/(ks)e. None of the above
The work done by the spring is -(mg)2/(2ks). Therefore, the correct option is A.
The work done by the spring, Ws, is determined by the force of the spring and the displacement of the block. The spring has a stiffness constant, ks, so the force exerted by the spring is ks multiplied by the displacement, s.
The block has a mass, m, and is in the presence of acceleration due to gravity, g. The work done by the spring is therefore
Ws = -(1/2) x ks x s² = -(1/2) x ks x (mg/ks)² = -(mg)²/(2ks).
Therefore, the answer is A: -(mg)2/(2ks)
The work done by the spring can be expressed in terms of the force of the spring and the displacement of the block. The force of the spring is proportional to the stiffness constant, ks, and the displacement of the block is dependent on the mass, m, and acceleration due to gravity, g.
The work done by the spring is equal to the negative of one-half of the stiffness constant multiplied by the displacement squared. Therefore, the answer is -(mg)2/(2ks).
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the speed of sound in water at a temperature of 25°c is 1500 m/s. what is the wavelength of a 300 hz sound wave traveling through water at a temperature of 25°c?
Answer:
The speed of sound in water at a temperature of 25°C is 1500 m/s. We can use the formula:
wavelength = speed of sound / frequency
where frequency is given as 300 Hz.
wavelength = 1500 m/s / 300 Hz
wavelength = 5 meters
Therefore, the wavelength of a 300 Hz sound wave traveling through water at a temperature of 25°C is 5 meters.
Explanation:
A van is moving at 10m/s. True or false? If the resultant force on this van is zero, the van will slow down and stop.
Answer: False
Explanation: It will move at a constant speed
Types of Waves
A transverse wave has the displacement _____________________________ to the direction of wave propagation. Give an example of this type of wave:
A longitudinal (AKA _____________________________ or __________________________) wave has the displacement _______________________________ to the direction of wave propagation. Give an example of this type of wave:
transverse : light
longitudinal : sound
transverse : up & down
longitudinal : left & right or side to side
transverse : perpendicular
longitudinal : parallel
transverse : up & down ocean wave
longitudinal : archer pulling back on a bowstring then letting go releasing the string
v = λf : speed of a wave is measured in meters per second (m/s), the wavelength is measured in meters (m), and the frequency is measured in hertz (Hz)
ANSWER:
A transverse wave has the displacement perpendicular (i.e., at right angles) to the direction of wave propagation. An example of a transverse wave is the wave on a string, where the displacement of the string is perpendicular to the direction in which the wave travels.
A longitudinal wave (also known as a compression wave or pressure wave) has the displacement parallel to the direction of wave propagation. An example of a longitudinal wave is sound waves, where the particles of the medium vibrate parallel to the direction of the wave as the wave travels through the medium.
chatgpt
Transverse waves:
The displacement of the wave is perpendicular to the direction of wave propagation.
Example: A wave on a string, where the string moves up and down while the wave moves left and right.
Simple analogy: Imagine shaking a jump rope up and down while holding it horizontally - the wave travels horizontally while the rope moves up and down.
Longitudinal waves:
The displacement of the wave is parallel to the direction of wave propagation.
Example: Sound waves, where air molecules move back and forth in the same direction as the wave.
Simple analogy: Imagine squeezing a slinky in a direction parallel to the slinky - the wave travels in that same direction while the slinky compresses and expands.
Formula used: There is no specific formula for describing the direction of wave displacement, as it depends on the type of wave. However, the speed of a wave can be calculated using the formula v = λf, where v is the speed of the wave, λ (lambda) is the wavelength, and f is the frequency.
Real-world example: Light waves are transverse waves, with the electric and magnetic fields perpendicular to the direction of propagation. This can be seen in polarization filters, which only allow light waves with a certain orientation of electric field to pass through.
Real-world example of longitudinal waves
An example of longitudinal waves in the real world is sound waves, which are pressure waves that propagate through a medium such as air, water, or solids. Sound waves are longitudinal waves because the vibrations of air molecules or particles in a medium are parallel to the direction of the wave's propagation. Examples of sound waves in daily life include the sound of a car engine, a musical instrument, or a person speaking.
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3. A fire hose is turned on, it exerts a pressure of 10kPa. If the diameter of the
jet is 0.6m, what is the force exerted? (remember there are 1000Pa to a kPa,
and the area of a circle is found by multiplying Pi by the radius squared).
The force exerted by the fire hose is 2.827 kN
force excerted calculation.
First, we need to calculate the area of the jet using the formula for the area of a circle:
Area = π x (radius)^2
We know the diameter of the jet is 0.6m, so the radius is half of that
radius = 0.6m / 2 = 0.3m
Plugging this value into the formula, we get:
Area = π x (0.3m)^2 = 0.2827 m^2
Next, we can use the formula for pressure to calculate the force exerted:
Pressure = Force / Area
Rearranging this formula to solve for force, we get:
Force = Pressure x Area
Plugging in the given values, we get:
Force = 10 kPa x 0.2827 m^2 = 2.827 kN
Therefore, the force exerted by the fire hose is 2.827 kN (kilonewtons).
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a certain hydraulic system is designed to exert a force 100 times as large as the one put into it. what must be the ratio of the area of the cylinder that is being controlled to the area of the master cylinder?
The ratio of the area of the cylinder that is being controlled to the area of the master cylinder must be 100:1. This is because, in a hydraulic system, the force is proportional to the area of the cylinder.
The hydraulic system works on the principle of Pascal's Law. Pascal's Law states that if there is an increase in pressure at any point in an enclosed fluid, there will be an equal increase in pressure at every other point in the container. Let's discuss the working of the hydraulic system with the help of the below diagram.
We have given that the force exerted by the system is 100 times greater than the one put into it. So we can say that the output pressure is 100 times the input pressure.
So,
Output pressure/Input pressure = 100/1
This pressure is the force per unit area, so it is also the ratio of the areas of the cylinders. We can write it as,
A₂/A₁ = 100/1
A₂ = 100*A₁
Therefore, the area of the cylinder being controlled (A₂) is 100 times the area of the master cylinder (A₁)
Hence, the required ratio of the area is 100:1.
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a 8-c charge is held initially at rest in a uniform electric field, then allowed to start moving. the electric potential at its starting point is 33 volts and the potential at its ending point is 17 volts. in units of joules, what is the value of its kinetic energy when it reaches its ending point?
The value of its kinetic energy when it reaches its ending point is 128 J.
The electric potential energy of a charge is given by the formula,
PE = qV
where,
PE is the potential energy of the charge, q is the charge, and V is the electric potential.
If the charge is allowed to move from a position of potential V₁ to a position of potential V₂, the change in potential energy can be expressed as follows:
ΔPE = q(V₂ - V₁)
The kinetic energy of a charge can also be determined from the electric potential energy that has been released to the charge as it travels through the electric field. That is,
KE = ΔPE = q(V₁ - V₂)
Thus, the value of its kinetic energy when it reaches its ending point,
KE = q(V₁ - V₂)
KE = 8 C(33 V - 17 V)
KE = 128 J
So, the value of its kinetic energy is 128 joules.
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suppose you repeated the experiment but started with all of the mass on the hanger and then de- creased it one increment at a time. would your results be different? why or why not?
If the experiment was repeated but started with all of the mass on the hanger and then decreased it one increment at a time, the results would be different. This is because the mass would be acting as a force, and decreasing the mass would decrease the force applied to the spring.
As a result, the spring would stretch less for each decrease in mass, and the relationship between the mass and the stretch of the spring would be different than in the original experiment. The spring constant of the spring would remain the same, but the data collected would be different due to the change in the force applied.
If you repeated the experiment by starting with all of the mass on the hanger and then decreased it one increment at a time, your results might be slightly different due to potential systematic errors or hysteresis effects in the system.
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a 190-km-long high-voltage transmission line 2.00 cm in diameter carries a steady current of 1,070 a. if the conductor is copper with a free charge density of 8.50 1028 electrons per cubic meter, how many years does it take one electron to travel the full length of the cable? (use 3.156 107 for the number of seconds in a year.)
Using the given values, the time for one electron to travel the full length of the transmission line is approximately 14 billion years. This calculation is based on the drift velocity of electrons in copper, which is very slow.
The drift velocity of electrons in copper, which is a measurement of how quickly they move in a certain direction under the influence of an electric field, may be used to determine how long it takes for one electron to travel the whole length of the transmission line. The high-voltage transmission line in this instance is 190 km long, 2.00 cm in diameter, and capable of transmitting a constant current of 1,070 A. One electron takes approximately 14 billion years to travel the whole length of the transmission line, according to the free charge density of copper. This is because numerous collisions with other atoms and heat agitation cause the electron drift velocity in copper to be extremely sluggish.
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a 4L of gas is under a pressure of 6atm. what is the volume of the gas at 2atm?
Considering the Boyle's Law, the volume of he gas at 2 atm is 12 L.
Definition of Boyle's LawBoyle's Law establishes the relationship between the pressure and volume of a gas when the temperature is constant.
Boyle's Law states that the pressure of a gas in a closed container is inversely proportional to the volume of the container.
Mathematically, this law is established as:
P×V= k
where
P is the pressure.V is the volume.k is a constant.Considering an initial state 1 and a final state 2, it is fulfilled:
P₁×V₁= P₂×V₂
New volumeIn this case, you know:
P₁= 6 atmV₁= 4 LP₂= 2 atmV₂= ?Replacing in definition of Boyle's law:
6 atm× 4 L= 2 atm× V₂
Solving:
(6 atm× 4 L)÷ 2 atm= V₂
(6 atm× 4 L)÷ 2 atm= V₂
12 L= V₂
Finally, the volume is 12 L.
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A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.0 ∘C, the resistance of the carbon resistor is 217.1 Ω .
What is the temperature on a spring day when the resistance is 215.1 Ω ? (Take the reference temperature T0 to be 4.0 ∘C.)
A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.0 ∘C, the resistance of the carbon resistor is 217.1 Ω
To find the temperature on a spring day when the resistance is 215.1 Ω,
1. Use the given information: initial temperature (T0) is 4.0°C, initial resistance (R0) is 217.1Ω, and final resistance (R) is 215.1Ω.
2. Use the temperature coefficient of resistance (α) for carbon. For carbon, α is typically around 0.0005 per degree Celsius (°C).
3. Apply the formula to relate resistance, temperature, and temperature coefficient:
R = R0 * (1 + α * (T - T0))
4. Solve for the final temperature (T):
215.1 = 217.1 * (1 + 0.0005 * (T - 4.0))
5. Rearrange the equation and solve for T:
(215.1 / 217.1) = 1 + 0.0005 * (T - 4.0)
0.9908 = 1 + 0.0005 * (T - 4.0)
-0.0092 = 0.0005 * (T - 4.0)
T - 4.0 = -0.0092 / 0.0005
T - 4.0 = -18.4
T = -14.4°C
So, the temperature on a spring day when the resistance is 215.1 Ω is -14.4°C.
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D
Question 40
M1
VI
Before
After
M2
V2
1 pts
A railroad car with a mass of 4,500 kg traveling at 3 m/s slams into a stationary railroad car and they couple. After coupling the cars are travelling 1.3 m/s. What is the
mass of the second railroad car, rounded to the nearest whole number? (Please remember that the initial mass you find is both train cars together. You will need to
subtract the mass of the first car from your answer.)
The second car has a mass of
kg.
The mass of the second railroad car, rounded to the nearest whole number, given that the car was initially at rest is 5884 Kg
How do I determine the mass of the second railroad car?The following data were obtained from the question:
Mass of 1st railroad car (m₁) = 4500 KgSpeed of 1st railroad car (u₁) = 3 m/sSpeed of second railroad car (u₂) = 0 m/sSpeed after collision (v) = 1.3 m/sMass of second railroad car (m₂) = ?The mass of second railroad car be obtained as illustrated below:
Momentum before = momentum after
m₁u₁ + m₂u₂ = v(m₁ + m₂)
(4500 × 3) + (m₂ × 0) = 1.3 × (4500 + m₂)
13500 + 0 = 5850 + 1.3m₂
13500 = 5850 + 1.3m₂
Collect like terms
13500 - 5850 = 1.3m₂
7650 = 1.3m₂
Divide both sides by 1.3
m₂ = 7650 / 1.3
m₂ = 5884 Kg
Thus, the mass of the second railroad car is 5884 Kg
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A closed vertical pipe contains layers of fluids mainly gas of thickness 1m, under pressure of 60 kpa, Ethyl alcohol of thickness of 60m and density 780 kg/m3, oil of thickness 10m and density 840 kg/m^3. Water of thickness 2m and density 990 kg/m^3 glycerine of thickness 3m and density 1,236 kg/m^3 and the remaining is molars is of thickness 10m and density 1,500 kg/m^3.Assume the fluids are separated and do not mix. a) In which fluid is pressure of 610 kpa first achieved. b) If the bottom of the pipe is at zero elevation what is the pressure at the bottom in kpa. c) At what elevation is the pressure of 640 kpa. d) If an open manometer is attached to the side of the pipe anywhere on the oily portion determine the height of the liquid level in the manometer.
Answer:
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Explanation:
Hydrostatic pressure is the pressure exerted by a fluid at equilibrium at any point of time due to the force of gravity. Hydrostatic pressure is proportional to the depth measured from the surface as the weight of the fluid increases when a downward force is applied. The hydrostatic pressure at any point in a fluid can be calculated by using the formula:
P = P0 + ρgh
where P is the hydrostatic pressure, P0 is the atmospheric pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the depth of the point from the surface.
a) In which fluid is pressure of 610 kPa first achieved?
It can be found out by adding up the hydrostatic pressures of each layer of fluid until we reach 610 kPa. Starting from gas layer:
Pgas = 60 kPa + (1 kg/m3)(9.81 m/s2)(1 m) = 60.00981 kPa
Palcohol = Pgas + (780 kg/m3)(9.81 m/s2)(60 m) = 460.00981 kPa
Poil = Palcohol + (840 kg/m3)(9.81 m/s2)(10 m) = 542.40981 kPa
Pwater = Poil + (990 kg/m3)(9.81 m/s2)(2 m) = 561.60981 kPa
Pglycerine = Pwater + (1236 kg/m3)(9.81 m/s2)(3 m) = 605.46981 kPa
Pmolasses = Pglycerine + (1500 kg/m3)(9.81 m/s2)(10 m) = 752.96981 kPa
The pressure of 610 kPa is first achieved in glycerine layer.
b) If the bottom of the pipe is at zero elevation what is
b) If the bottom of the pipe is at zero elevation what isthe pressure at bottom in kpa?
The bottom of pipe corresponds to molasses layer so use it to calculate hydrostatic pressure as calculated above:
Pbottom = Pmolasses = 752.96981 kPa
c) At what elevation is pressure of 640kpa?
It can be found out by subtracting hydrostatic pressures from each layer until it reach below 640kpa and then use interpolation to find exact elevation.
Starting from molasses layer:
Pmolasses - Pglycerine= (752.96981 - 605.46981)kpa=147.5kpa
This means that somewhere between glycerine and molasses layers there is a point with pressure of 640kpa.
Let x be distance from top surface of molasses layer to this point then:
640kpa=605.4698+1500(9.8)x
x=0.023m
Therefore elevation from bottom surface of pipe to this point is:
10-0-0-023=9-977m
d) If an open manometer attached to side pipe anywhere on oily portion determine height liquid level manometer.
An open manometer measures difference between atmospheric pressure and fluid pressure inside pipe.
Let y be height liquid level manometer above oil level then:
Patm-Poil=yρg
y=(Poil-Patm)/ρg
y=(542-4098-101325)/(1000*9-8)
y=-44-6m
This means that liquid level manometer will be below oil level by -44-6m or oil level will be above liquid level manometer by +44-6m.
A 0.155 kg arrow is shot from ground level, upward at 31.4 m/s. What is its potential energy (PE) when it is 30.0 m above the ground?
Answer:
Kinetic energy (K.E) when it is 30.0 m above the ground is 30.84 J .
Explanation:
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boat travels at velocity 45 mph in a direction 20.0osouth of west. Find the components of the boat's velocity
Answer:
Explanation:
We can break down the velocity of the boat into its components using trigonometry.
Let's call the velocity of the boat "v" and let the angle between the boat's velocity vector and the westward direction be represented by θ, where θ = 20.0°.
The x-component of the velocity can be found using cosine:
vx = v * cos(θ)
vx = 45 mph * cos(20.0°)
vx = 42.58 mph (rounded to two decimal places)
The y-component of the velocity can be found using sine:
vy = v * sin(θ)
vy = 45 mph * sin(20.0°)
vy = 15.34 mph (rounded to two decimal places)
Therefore, the components of the boat's velocity are vx = 42.58 mph west and vy = 15.34 mph south.
what is the potential difference between the plates of a 4.6-f capacitor that stores sufficient energy to operate a 75.0-w light bulb for one minute?
The potential difference between the plates of a 4.6-f capacitor that stores sufficient energy to operate a 75.0-w light bulb for one minute is 325V.
It can be determined by the equation V = E/C,
where V is the potential difference,
E is the stored energy, and C is the capacitance.
Therefore, the potential difference
V= E/C,
Substituting the values we get,
We are multiplying by the stored energy by 60 since the energy required to operate the light bulb is for one minute.
Therefore we get,
V=(75.0-w × 60s) / 4.6-f
= 325 V.
The potential difference is 325V.
To operate a 75.0-w light bulb for one minute , 325V potential difference between the plates of a 4.6-f capacitor is required.
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star a and star b are both standard candles. we are able to determine they are the same luminosity, but star a appears fainter. which star is closer?
The star which appears fainter is farther. Star A and B are both standard candles, but Star A appears fainter, so it is farther.
A standard candle is an object of a known luminosity that astronomers can use to estimate distances based on the difference between its apparent and absolute magnitudes. Astronomers discovered that the luminosity of a standard candle can be calculated using its apparent magnitude because the apparent magnitude of an object is related to its luminosity. The luminosity of the stars determines how bright they are. Star A appears fainter than Star B despite being identical in luminosity because it is farther away from Earth. The farther an object is, the fainter it appears. The relationship between an object's luminosity, distance, and apparent magnitude is described by the inverse-square law, which states that the intensity of light is inversely proportional to the square of the distance from the source.
The formula for the inverse-square law can be used to calculate how much brighter an object appears when it is closer to the observer. If two objects have the same luminosity and one is farther away than the other, the closer object will appear brighter.
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in the double slit experiment, light passes through two slits and a pattern of dark and bright fringes appears on a screen. why don't you see a pattern of light and dark fringes on a wall that is illuminated by two ordinary light bulbs?
Answer:
We dont see a pattern of light and dark fringes on a wall that is illuminated by two ordinary light bulbs beca.
3. What average net force is required to stop a 7 kg shopping cart in 2 s if it's initially
traveling at 3. 5 m/s?
An average net force of -12.25 N is required to stop a 7 kg shopping cart that is initially moving at 3.5 m/s in 2 seconds, acting in the opposite direction to the cart's initial velocity.
To determine the average net force required to stop a 7 kg shopping cart in 2 s, we can use the equation:
Δv = aΔt
where Δv is the change in velocity, a is the acceleration, and Δt is the time interval.
Initially, the shopping cart is traveling at a velocity of 3.5 m/s, and it comes to a stop in 2 s, so Δv = -3.5 m/s. We can rearrange the equation above to solve for the acceleration:
a = Δv / Δt = (-3.5 m/s) / (2 s) = -1.75 m/s²
The negative sign indicates that the acceleration is in the opposite direction to the initial velocity, which is necessary to stop the cart. Finally, we can use Newton's second law, F = ma, to calculate the average net force required:
F = ma = (7 kg) x (-1.75 m/s²) = -12.25 N
The negative sign indicates that the force is in the opposite direction to the initial velocity of the cart. Therefore, an average net force of 12.25 N is required to stop the 7 kg shopping cart in 2 s, assuming constant acceleration.
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an advantage of conducting a true experiment in the laboratory (as opposed to conducting a true experiment in the field) is that in the laboratory, it is somewhat easier to:
An advantage of conducting a true experiment in the laboratory (as opposed to conducting a true experiment in the field) is that in the laboratory, it is somewhat easier to: control the variables.
Conducting a true experiment in the laboratory, as opposed to conducting one in the field, has the advantage that it is somewhat easier to control the variables. In the laboratory, all factors influencing the experiment can be easily manipulated and monitored, ensuring that the experiment is conducted accurately and reliably.
This includes factors such as temperature, humidity, light levels, and other environmental factors. Additionally, laboratory equipment can be used to measure variables that cannot be monitored in the field. For example, with the help of a microscope, minute changes in the structure of a plant can be observed and measured.
In summary, conducting a true experiment in the laboratory provides the researcher with greater control over the environment and measurement of variables, making it a much more accurate and reliable method than conducting an experiment in the field.
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what is the process in determining the size of hail stones, weather spotters should report the longest dimension of the largest hail stone.
The process of determining the size of hailstones involves the following steps:
1. Observe the hailstones.
2. Measure the longest dimension.
3. Compare to a common object.
4. Document the hailstone.
5. Report the size.
1. Observe the hailstones: When it is safe to do so, weather spotters should collect the largest hailstone they can find.
2. Measure the longest dimension: Use a ruler or measuring tape to measure the longest dimension of the largest hailstone.
This is the size that weather spotters should report.
3. Compare to a common object: For easier communication, it's helpful to compare the hailstone size to a common object, such as a coin, golf ball, or baseball.
4. Document the hailstone: Take a photograph of the hailstone next to the measuring device or common object for reference.
5. Report the size: Weather spotters should report the longest dimension of the largest hailstone to their local weather agency or storm spotting network.
Remember, always prioritize safety when observing and measuring hailstones.
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Use k = 9 x 10⁹ Nm²/C². 3. Two point charges, q1 and 92, of 4.00 μC each, are placed -16.0 cm and 16.0 cm away from the origin on the x-axis. A charge q3 of -1.00 μC is placed 12.0 cm away from the origin on the y- axis.
a.find thr distsance from q3 to q1 and from q3 to q2.
b.find the magnitude and the direction of the force F13 exerted by q1 on q3.
c.find the magnitude and the direction of the force F23 exerted by q2 on q3.
d.find the magnitude and the direction of the force f12 exerted by q1 on q2.
a. Distance from q₃ to q₁ = 23.0 cm
b. the magnitude and the direction of the force F₁₃ exerted by q₁ on q₃ -3.00 x 10⁻³ N.
c. The magnitude and the direction of the force F23 exerted by q2 on q3 = -3.00 x 10⁻³ N
d. The magnitude and the direction of the force F₂₃ exerted by q₂ on q₁ = -7.5 x 10⁻⁵ N
How to find distance from q₃ to q₁ and from q₃ to q₂?To find the distance from q₃ to q₁ and from q₃ to q₂, we can use the Pythagorean theorem. The distance from q₃ to q₁ is the hypotenuse of a right triangle with legs of 12.0 cm (the distance from q₃ to the origin on the y-axis) and 16.0 cm + 4.00 cm = 20.0 cm (the distance from q₁ to the origin on the x-axis). Thus:
distance from q₃ to q₁ = √(12.0 cm² + 20.0 cm²) = 23.0 cm
Similarly, the distance from q₃ to q₂ is the hypotenuse of a right triangle with legs of 12.0 cm (the distance from q₃ to the origin on the y-axis) and 16.0 cm - 4.00 cm = 12.0 cm (the distance from q₂ to the origin on the x-axis). Thus:
distance from q₃ to q₂ = √(12.0 cm² + 12.0 cm²) = 16.97 cm (to two significant figures)
How to find the magnitude and the direction of the force F₁₃ exerted by q₁ on q₃?
To find the magnitude of the force F₁₃ exerted by q₁ on q₃, we can use Coulomb's law:
F₁₃ = k * q₁ * q₃/ r₁₃²
where k = 9 x 10⁹ Nm²/C² is the Coulomb constant, q₁ and q₃ are the charges in coulombs, and r₁₃ is the distance between the charges in meters. In this case, q₁ = q₃ = 4.00 μC = 4.00 x 10⁻⁶ C and r₁₃ = 12.0 cm = 0.12 m. Thus:
F₁₃ = (9 x 10⁹ Nm²/C²) * (4.00 x 10⁻⁶ C) * (-1.00 x 10⁻⁶ C) / (0.12 m)²
= -3.00 x 10⁻³ N
The negative sign indicates that the force is attractive, since q₁ and q₃ have opposite signs.
c. q₂ = q₁, so The magnitude and the direction of the force F₂₃ exerted by q₂ on q₃ = -3.00 x 10⁻³ N
d. q₃ = 1/4q₂, so -3.00 x 10⁻³/4 N
= −0.00075 = -7.5 x 10⁻⁵
The magnitude and the direction of the force F₂₃ exerted by q₂ on q₁ = -7.5 x 10⁻⁵ N
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v = Circular motion constant speed
a = Centripetal acceleration
f = Centripetal force
In circular motion with constant speed, the object moves in a circular path at a constant speed, while experiencing centripetal acceleration and centripetal force directed towards the center of the circle.
Using a circular image show the circular motion constant speed, centripetal acceleration, centripetal force?In circular motion with constant speed, the object moves in a circular path at a constant speed. This means that the object covers equal distance in equal time intervals. The velocity of the object is tangential to the circle at every point.
Centripetal acceleration is the acceleration of an object moving in a circular path, directed towards the center of the circle. It is always perpendicular to the velocity of the object and is given by the formula a = v^2/r, where a is the centripetal acceleration, v is the velocity of the object, and r is the radius of the circular path.
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a projectile is launched upward with a velocity of 128 feet per second from the top of a 50-foot platform. what is the maximum height attained by the projectile?
We can solve this problem using the kinematic equations of motion for a projectile under constant acceleration due to gravity. In particular,
we can use the equation:
h = y + viy×t - (1/2)gt²
where h is the maximum height attained by the projectile,
y is the initial height of the projectile (in this case, 50 feet), viy is the initial vertical velocity of the projectile (in this case, 128 feet per second),
t is the time it takes for the projectile to reach its maximum height,
and g is the acceleration due to gravity (which we take to be 32.2 feet per second squared).
To find the time it takes for the projectile to reach its maximum height, we can use the fact that the projectile will reach its maximum height when its vertical velocity becomes zero.
At this point, the projectile will have traveled halfway through its trajectory, so the time it takes to reach the maximum height is given by:
tmax = viy/g
Plugging in the given values, we get:
tmax = 128/32.2 seconds
tmax ≈ 3.98 seconds
Now, we can use the equation for the maximum height:
h = y + viy×t - (1/2)gt²
Plugging in the values we have calculated, we get:
h = 50 + 128×3.98 - (1/2)32.2(3.98)²
h ≈ 403.2 feet
Therefore, the maximum height attained by the projectile is approximately 403.2 feet.
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What would happen to a substance at
the theoretical temperature of 0 K?
(1 point)
The substance's particles would
accelerate.
The substance would turn from
solid to gas.
The substance's particles would
stop moving.
The substance would turn from
liquid to solid.
At the theoretical temperature of 0 K (also known as absolute zero), the substance's particles would stop moving.
This is because temperature is a measure of the average kinetic energy of the particles in a substance, and at 0 K, there is no thermal energy left to sustain motion.
At this temperature, all molecular motion and vibration would cease, and the substance would have the lowest possible energy state. This is the coldest temperature possible, and no substance can be cooled to exactly 0 K, although temperatures very close to absolute zero can be achieved in laboratory settings using cryogenic cooling techniques.
Therefore, the correct answer is: The substance's particles would stop moving.
What is kinetic energy?
Kinetic energy is the energy that an object possesses due to its motion. It is a form of energy that an object has because of its speed and mass. The formula for kinetic energy is:
KE = 1/2 * m * v^2
where KE is the kinetic energy, m is the mass of the object, and v is the velocity of the object.
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how many joules of work are done by a 2.0-horsepower motor that runs for 1.0 hour (assuming 100% efficiency)? round to two significant digits.
A 2.0-horsepower motor that runs for 1.0 hour will do 5.4 x 10^6⁶ joules of work (rounded to two significant digits) assuming 100% efficiency.
To calculate the work done by the motor, we need to use the formula: Work = Power x Time
The power of the motor is given in horsepower, so we need to convert it to watts to use it in the formula. One horsepower is equal to 746 watts, so a 2.0-horsepower motor is equivalent to 1492 watts.
Now we can plug in the values:
Work = 1492 watts x 1 hour
Since 1 hour is equal to 3600 seconds, we can convert it to joules
Work = 1492 watts x 3600 seconds
Work = 5.35 x 10⁶ joules
Finally, we round the answer to two significant digits, which gives us 5.4 x 10⁶ joules. Therefore, a 2.0-horsepower motor that runs for 1.0 hour will do 5.4 x 10⁶ joules of work assuming 100% efficiency.
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an acrobat with a mass of 49-kg jumps on a trampoline. what force does a trampoline have to apply to accelerate her straight up at 7.9 m/s2 in newtons?
An acrobat with a mass of 49-kg jumping on a trampoline, the force that the trampoline has to apply to accelerate her straight up at [tex]7.9m/s^2[/tex] in newtons is 867.3 N.
How to calculate force? Force is the product of mass and acceleration.
Hence, F = ma
Where, F = Net force applied
m = mass of an object
a = net acceleration
Force can be calculated by multiplying the mass of the object with the acceleration experienced by it.
In this case, m = 49kg and a = [tex]7.9 m/s^2[/tex]
Force applied by earth gravity on the acrobat is mg, which equals 49*9.8 N i.e., 480.2 N.
[tex]F - F_{gravity}=ma \\F-F_{gravity} = ma\\F = F_{gravity}+ma\\F=480.2+49*7.9 N \\F=867.3 N\\[/tex]
So, F= 867.3 N is required.
Therefore, the trampoline has to apply a force of 867.3 N to accelerate the acrobat straight up at [tex]7.9 m/s^2[/tex].
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