The intensity of sound at 4 m from a 500 W speaker is found using the inverse square law of sound propagation. Therefore, the energy absorbed by the eardrum per minute is approximately 0.107 millijoules.
The intensity of sound is the power per unit area and is given by the formula I = P/A, where I is intensity, P is power and A is the surface area. Given that the speaker has a power of 500 W and the distance is 4 m, we can find the intensity of sound using the inverse square law of sound propagation.
[tex]I = P/(4\pi r^{2} )[/tex]
[tex]I = 500/(4\pi \times 4^{2} )[/tex]
I = 4.93 W/m²
Therefore, the intensity of sound at a distance of 4 m from the speaker is 4.93 W/m².
To calculate the energy absorbed by the eardrum per minute, we need to first convert the intensity to units of energy per time per area, which is given by the formula E = ItA, where E is energy, t is time, and A is the surface area.
The energy absorbed per minute is:
E = ItA
[tex]E = 4.93 W/m^{2} \times 60 s/min \times 600\;mm^{2} \times (1 m / 1000\;mm)^{2}[/tex]
E = 0.107 mJ/min
Therefore, the energy absorbed by the eardrum per minute is approximately 0.107 millijoules.
In summary, the intensity of sound at 4 m from a 500 W speaker is found using the inverse square law of sound propagation. The energy absorbed by the eardrum per minute is calculated by converting the intensity to units of energy per time per area and using the surface area of the ear.
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A kettle is made from metal. If the live wire inside this kettle were to come loose and touch the metal casing, you could get an __________ __________ if you then touched the kettle. What two words complete this sentence?
Answer: electric shock
Explanation: cuz metal is conductor of electricity
which of the following is incorrect
Calcium reacts with water to form calcium is an incorrect statement. Option A
What is incorrect?When calcium reacts with water, it forms calcium hydroxide and hydrogen gas, according to the following equation:
Ca + 2H2O → Ca(OH)2 + H2
Therefore, the correct statement should be: Calcium reacts with water to form calcium hydroxide and hydrogen gas.
B. Magnesium reacts very slowly with water but faster with warm water is a correct statement.
C. Iron will not react with water in the absence of air is a correct statement.
D. Sodium reacts with water is a correct statement. When sodium reacts with water, it forms sodium hydroxide and hydrogen gas, according to the following equation:
2Na + 2H2O → 2NaOH + H2
E. Copper reacts with steam is an incorrect statement. Copper does not react with steam, but it reacts with hot concentrated sulfuric acid to form copper(II) sulfate, sulfur dioxide gas, and water, according to the following equation:
Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O
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Missing parts;
Which of the following statements is incorrect?
A. Calcium reacts with water to form calcium
B. Magnesium reacts very slowly with water but faster with warm water
C. Iron will not react with water in the absence of air
D. Sodium reacts with water
E. Copper reacts with steam
What is the torque exerted by the wrench in scenario c?
What is the torque exerted by the wrench in scenario d?
If you've figured out all of the torques correctly, then you can clearly see that the scenario with the highest torque is:
The torque exerted by the wrench in scenario (c) and (d) is 'LF'. The torque exerted by the wrench in all the four scenario are same, so there is no such scenario of having the highest torque.
We know, Torque is the cross product of radius vector and force vector. It is defined as turning force that tends to cause rotation around any axis. It is also referred to as the 'Moment of Force'.
Mathematically,
Torque, ζ = r × F = r F sinθ
In case (a.),
The force vector is perpendicular to the radius vector (or the length) i.e., θ = 90°
∴ ζ = r × F = L × F = LF
In case (b.)
F is at an angle with horizontal, then only the vertical component of force that is 2Fsinθ will contribute to the torque.
∴ ζ = r × 2Fsin30° = L × 2F × (1/2) = LF
In case (c.),
The force vector is perpendicular to the radius vector i.e., θ = 90°
∴ ζ = r × F = 2L × (F/2) = LF
In case (d.),
Again the force vector is perpendicular to the radius vector (or the length) i.e., θ = 90°
∴ ζ = r × F = (L/2) × 2F = LF
Therefore, torque exerted by wrench in all scenario is same i.e., LF.
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An object in free fall has a velocity of 5 m/s in the upward direction. What is the instantaneous velocity of the object one second later?
An object in free fall near the Earth's surface has an acceleration due to gravity of 9.8 m/s² downward. If the object has an initial velocity of 5 m/s upward, it will continue to move upward for a while before gravity pulls it back down.
One second later, the object will have been under the influence of gravity for one more second. During this time, its upward velocity will have decreased by 9.8 m/s² due to the acceleration of gravity, making it zero at the highest point of its trajectory.
As the object continues to fall, its downward velocity will increase by 9.8 m/s every second. Therefore, one second after starting with an initial velocity of 5 m/s upward, the object will have a velocity of 5 m/s downward.
In summary, assuming the object is in free fall near the surface of the Earth, its initial velocity of 5 m/s upward will be reversed by the acceleration due to gravity, resulting in a velocity of 5 m/s downward one second later.
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A football game begins with a kickoff in which the ball travels a horizontal distance of 45 yd and lands on the ground. Suppose the ball is punted from an initial height of 0.740 m.
A) If the ball was kicked at an angle of 42.0° above the horizontal, what is the initial speed of the ball in this case? Express your answer using two significant figures.
The initial speed of the ball is approximately 22.0 m/s.
What is the initial speed of the ball?We can solve this problem using the kinematic equations of motion.
The initial velocity of the ball can be broken down into horizontal and vertical components. The horizontal component will remain constant throughout the flight, while the vertical component will be affected by gravity. We can use the following equations:
Horizontal motion:
x = v_x*t
Vertical motion:
y = v_y*t - (1/2)gt²
where:
x = horizontal distance traveled by the ball (45 yd = 40.8 m)y = initial height of the ball (0.740 m)v_x = initial horizontal velocity of the ball (unknown)v_y = initial vertical velocity of the ball (unknown)g = acceleration due to gravity (9.81 m/s^2)t = time of flight (unknown)We can solve for t by setting y = 0 (since the ball lands on the ground):
0 = v_y*t - (1/2)gt²
Solving for t, we get:
t = (2*v_y)/g
Now we can use the horizontal motion equation to solve for v_x:
x = v_xt
v_x = x/t
v_x = xg/(2*v_y)
Substituting the given values, we get:
v_x = (40.8 m)(9.81 m/s^2)/(2sin(42.0°)*cos(42.0°))
v_x ≈ 22.0 m/s
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Assuming your skin temperature is 37. 2 C and the temperature of your surroundings is 23. 4C , determine the length of time required for you to radiate away the energy gained by eating a 335- C ice cream cone. Let the emissivity of your skin be 0. 915 and its area be 1. 27 m^2
T=___h
It would take approximately 4.4 hours for the person to radiate away the energy gained by eating the ice cream cone.
To calculate the time required for a person to radiate away the energy gained by eating an ice cream cone, we need to use the Stefan-Boltzmann law, which states that the rate of heat transfer from an object is proportional to the fourth power of its temperature and its surface area.
The formula is given as: Q/t = εσA([tex]T^{4}[/tex] - [tex]T0^{4}[/tex])
where Q is the heat energy gained by eating the ice cream, t is the time taken to radiate it away, ε is the emissivity of the skin, σ is the Stefan-Boltzmann constant, A is the surface area of the skin, T is the skin temperature, and T0 is the temperature of the surroundings.
Plugging in the given values, we get: 335,000 J/t = 0.915 x 5.67 x [tex]10^{-8}[/tex] x 1.27 x ([tex]373.2^{4}[/tex] - [tex]296.4^{4}[/tex])
Solving for t, we get t ≈ 4.4 hours.
Therefore, it would take approximately 4.4 hours for the person to radiate away the energy gained by eating the ice cream cone.
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single convex lenses can be used to make images of distant objects. will these images be real or imaginary? will they be inverted or upright? will they be larger or smaller than the original object? where does the image occur relative to the focus? (specify which side of the lens)
Single convex lenses can create real and inverted images of distant objects, with size depending on object distance and focal length. The image appears on the opposite side of the lens from the object, between the lens and its focus.
Single convex lenses can be used to make real and inverted images of distant objects. The size of the image depends on the distance of the object from the lens and the focal length of the lens.
If the object is very far away from the lens, the image will be small. The image will occur on the side of the lens opposite to the object and between the lens and its focus.
The image will be real and inverted because the convex lens converges the light rays that pass through it.
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Particles q1, 92, and q3 are in a straight line.
particles q1 = -1.60 x 10-19 c, 92 = +1.60 x 10-19 c,
and q3 = -1.60 x 10-19 c. particles 91 and q2 are
separated by 0.001 m. particles q2 and q3 are
separated by 0.001 m. what is the net force on 92?
remember: negative forces (-f) will point left
positive forces (+f) will point right
-1.60 x 10-19 c
+1.60 x 10-19
-1.60 x 10-19 c
91
+ 92
93
0.001 m
0.001 m
The net force on particle q₂ is approximately 4.60 x 10⁻¹⁴ N to the right.
To find the net force on particle q₂, we need to calculate the electric force that each of the other particles exerts on it and add them up vectorially.
The electric force between two point charges is given by Coulomb's law
F = k × q₁ × q₂ / r²
where F is the electric force in Newtons, k is Coulomb's constant (9 x 10⁹ N m² / C²), q₁ and q₂ are the magnitudes of the charges in Coulombs, and r is the distance between the charges in meters.
Let's first calculate the force that particle q₁ exerts on particle q₂. The magnitude of the electric force between them is:
F1 = k × |q₁| × |q₂| / r² = (9 x 10⁹ N m² / C²) × (1.60 x 10⁻¹⁹ C) × (1.60 x 10⁻¹⁹ C) / (0.001 m)² ≈ 2.30 x 10⁻¹⁴ N
The direction of the force is to the left, because particles q₁ and q₂ have opposite charges.
Now let's calculate the force that particle exerts on particle q₃. The magnitude of the electric force between them is the same as the magnitude of the force between particles q₁ and q₂
F2 = k × |q₂| × |q₃| / r₂ = (9 x 10⁹ N m² / C²) x (1.60 x 10⁻¹⁹ C) x (1.60 x 10⁻¹⁹ C) / (0.001 m)² ≈ 2.30 x 10⁻¹⁴ N
The direction of the force is to the right, because particles q₂ and q₃ have opposite charges.
Finally, we can calculate the net force on particle q₂ by subtracting the force to the left from the force to the right
Fnet = F2 - F1 ≈ 4.60 x 10¹⁴ N to the right
Therefore, the net force on particle q₂ is approximately 4.60 x 10⁻¹⁴ N to the right.
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Running with an initial velocity of 10.2 m/s m / s , a horse has an average acceleration of -1.77 m/s2 m / s 2 . how much time does it take for the horse to decrease its velocity to 6.1 m/s m / s ?
It takes approximately 2.32 seconds for the horse to decrease its velocity to 6.1 m/s.
Using the given terms, we can solve the problem using the formula for acceleration:
a = (v_f - v_i) / t
Where:
a = -1.77 m/s² (average acceleration)
v_i = 10.2 m/s (initial velocity)
v_f = 6.1 m/s (final velocity)
t = time (which we need to find)
Rearranging the formula to solve for time:
t = (v_f - v_i) / a
Substituting the given values:
t = (6.1 m/s - 10.2 m/s) / (-1.77 m/s²)
t = (-4.1 m/s) / (-1.77 m/s²)
Now, calculating the time:
t ≈ 2.32 seconds
It takes approximately 2.32 seconds for the horse to decrease its velocity to 6.1 m/s.
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While at the parent-teacher conference, murphy’s teacher mentions that the apollo program-the same program that landed humans on the moon-was just propaganda to convince the soviet union to bankrupt themselves trying to do the same. the reason for this was to encourage children to take care of their own planet, rather than wasting precious resources day dreaming of leaving it. which side of the fence would you sit on? would you look for ways to save earth and our ability to stay there, or would you look to the sky, and find a new plant to live on? why?
interstellar movie☝️
I would sit on the side of looking for ways to save Earth and our ability to stay there, rather than looking to the sky to find a new planet to live on.
While finding new habitable planets is an interesting scientific pursuit, it is not a practical solution to the problems we face on Earth. Instead, we should focus on preserving and restoring our planet's ecosystems, reducing our carbon footprint, and developing sustainable technologies. Furthermore, the idea that the Apollo program was just propaganda is a conspiracy theory without any evidence to support it.
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A pile driver is raised to a height if 3. 0m. How high would another pile driver with twice the mass of the first have ti be raised in order to have the same amount of potential energy? Please draw the work out! (20 points!)
The second pile driver must be raised to a height of 1.5m.
Assume the mass of the first pile driver is m and its height is h. Therefore, the potential energy (PE) of the first pile driver is given by:
PE1 = m * g * h
where g is the acceleration due to gravity.
Now, let's find the potential energy of the second pile driver, which has twice the mass of the first pile driver. The mass of the second pile driver is 2m.
To have the same amount of potential energy as the first pile driver, the second pile driver must be raised to a certain height, let's call it h2.
Therefore, the potential energy (PE2) of the second pile driver is given by:
PE2 = (2m) * g * h2
Since we want the potential energy of both pile drivers to be equal, we can set up an equation:
PE1 = PE2
m * g * h = (2m) * g * h2
We can cancel out the mass and acceleration due to gravity:
h = 2 * h2
Now we can solve for h2:
h2 = h / 2
Plugging in the value of h as 3.0m, we have:
h2 = 3.0m / 2
h2 = 1.5m
Therefore, the second pile driver, with twice the mass of the first pile driver, must be raised to a height of 1.5m in order to have the same amount of potential energy.
Here's a visual representation of the work:
First pile driver:
Potential energy (PE1) = m * g * h
Second pile driver:
Potential energy (PE2) = (2m) * g * h2
Since PE1 = PE2, we have m * g * h = (2m) * g * h2
Cancelling out mass and acceleration due to gravity, we get h = 2 * h2
Solving for h2, we find h2 = h / 2
Plugging in the value of h, we have
h2 = 3.0m / 2
= 1.5m
Therefore, the second pile driver must be raised to a height of 1.5m.
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The team coach is watching the bowler. She notes in Table 1 how
far the ball travels, and the time taken to reach the batsman.
Table 1
Ball
1
2
3
4
5
Time in s
0. 42
0. 46
0. 48
0. 55
0. 58
Distance in m
17. 55
18. 30
18. 40
17. 90
17. 75
Suggest a pattern, if any, between the time the ball is in flight and
the distance the ball travels.
What is the resolution of the stopwatch the team coach uses to
time the ball?
There is a relationship between the time the ball is in the air and the distance it travels. As the time increases, the distance decreases. The coach's stopwatch has a resolution of between 0.04s and 0.07s.
There seems to be a pattern between the time the ball is in flight and the distance it travels. From Table 1, we can see that as the time taken for the ball to reach the batsman increases, the distance the ball travels decreases.
For instance, ball 1 takes the least time to reach the batsman (0.42s) and travels the greatest distance (17.55m), while ball 5 takes the most time (0.58s) and travels the shortest distance (17.75m). This pattern suggests that the distance traveled by the ball decreases with increasing time taken to reach the batsman.
To determine the resolution of the stopwatch used by the coach, we can look at the smallest difference in time between two consecutive balls. From Table 1, we can see that the difference between the times of balls 1 and 2 is 0.04s, while the difference between the times of balls 3 and 4 is 0.07s.
Therefore, we can assume that the resolution of the stopwatch is somewhere between 0.04s and 0.07s. However, we cannot determine the exact resolution without more data.
In summary, there is a pattern between the time the ball is in flight and the distance it travels. As the time taken for the ball to reach the batsman increases, the distance the ball travels decreases. The resolution of the stopwatch used by the coach is estimated to be between 0.04s and 0.07s.
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The microwave transmitters that we use have a frequency of about 10 ghz. What is the approximate wavelength?.
The approximate wavelength of a 10 GHz microwave transmitter is 3 centimeters.
The approximate wavelength of a microwave transmitter with a frequency of 10 GHz can be calculated using the formula:
wavelength = speed of light / frequency
where the speed of light is approximately 3.00 × 10^8 meters per second.
So, the wavelength of a 10 GHz microwave transmitter would be:
wavelength = 3.00 × 10^8 m/s / 10 × 10^9 Hz
wavelength = 0.03 meters or 3 centimeters
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19. Evaluate the frequency of the third harmonics of a
closed pipe of length 0. 3m. [speed of sound in air = 340ms-']
(a) 1416. 7Hz (b) 850. 0Hz(c) 1511. 1 Hz(d) 283. 3 Hz
The frequency of the third harmonic is approximately 1416.7 Hz (option a).
The frequency of the third harmonics of a closed pipe can be calculated using the formula:
f = (2n + 1) * (v / 4L)
Where:
f = frequency of the harmonic
n = harmonic number (n = 2 for the third harmonic)
v = speed of sound in air (340 m/s)
L = length of the closed pipe (0.3 m)
Using the given values, we can calculate the frequency:
f = (2 * 2 + 1) * (340 / 4 * 0.3)
f = (5) * (340 / 1.2)
f = 5 * 283.3333
f ≈ 1416.7 Hz
So, the frequency of the third harmonic is approximately 1416.7 Hz (option a).
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You travel 20.0 km to the right and you realized you have to drive back 5.0 km. the journey took 2 hours to complete. find the following:
a. the total distance you traveled
b. the total displacement you traveled
c. your average speed
d. your average velocity
(pls put an explanation the the answers ty!!)
The total distance you traveled is 25.0 km, and the total displacement you traveled is 15.0 km to the right and average speed is 12.5 km/h and velocity is 7.5 km/h to the right.
a. To find the total distance you traveled, add the distance you traveled to the right (20.0 km) and the distance you traveled back (5.0 km). Total distance = 20.0 km + 5.0 km = 25.0 km.
b. To find the total displacement, subtract the distance you traveled back (5.0 km) from the distance you traveled to the right (20.0 km). Total displacement = 20.0 km - 5.0 km = 15.0 km to the right.
c. To find your average speed, divide the total distance you traveled by the time it took to complete the journey. Average speed = Total distance / Time = 25.0 km / 2 hours = 12.5 km/h.
d. To find your average velocity, divide the total displacement by the time it took to complete the journey. Average velocity = Total displacement / Time = 15.0 km / 2 hours = 7.5 km/h to the right.
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a simple pendulum has a period of 3.15 s. the acceleration of gravity is 9.8 m/s 2 . what is its length? answer in units of m.
The length of the pendulum is 0.389 m.
The length of a simple pendulum can be calculated using the equation:
T = 2π√(L/g)
where T is the period of the pendulum, L is the length of the pendulum, and g is the acceleration due to gravity.
Rearranging the equation to solve for L, we get:
L = (gT²)/(4π²)
Substituting the given values, we get:
L = (9.8 m/s²)(3.15 s)²/(4π²) = 0.389 m
As a result, the pendulum's length is 0.389 m.
A longer pendulum will have a longer period and a shorter pendulum will have a shorter period, all other factors remaining constant. Similarly, a higher acceleration due to gravity will result in a shorter period, while a lower acceleration due to gravity will result in a longer period.
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There is an assassin who climbed to the top of the catwalk balcony of a mansion to get a good view of his target who is 3. 1 feet tall the assassin pulls the trigger when the target is 294 feet away discharging the bullet 63 angle to the level of the victims head find the height that the assassin shot the target from
The height from which the assassin shot the target= 580.10 feet
To find the height from which the assassin shot the target, we can use the following formula:
Height = (Distance × tan(Angle)) + Target Height
Where:
- Height is the height from which the assassin shot the target
- Distance is the horizontal distance between the assassin and the target (294 feet)
- Angle is the angle between the horizontal line and the line of sight (63 degrees)
- Target Height is the height of the target (3.1 feet)
First, calculate the height difference using the distance and angle:
Height Difference = 294 × tan(63 degrees)
Height Difference ≈ 577.00 feet
Now, add the target height to find the total height from which the assassin shot:
Height = Height Difference + Target Height
Height = 577.00 + 3.1
Height ≈ 580.10 feet
The assassin shot the target from a height of approximately 580.10 feet.
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Dylan has a weight of 620 n when he is standing on the surface of the earth. what would his weight (the gravitational force due to the earth) be if he tripled his distance from the center of the earth by flying in a spacecraft?
If Dylan were to triple his distance from the center of the Earth by flying in a spacecraft, his weight on the surface of the Earth would decrease to one-ninth of his original weight, which is approximately 69 N.
According to the law of universal gravitation, the weight of an object is directly proportional to the mass of the planet and inversely proportional to the square of the distance from the center of the planet.
Therefore, if Dylan triples his distance from the center of the Earth by flying in a spacecraft, his weight on the surface of the Earth would be one-ninth of his original weight. This is because the distance has been tripled, and the inverse square of three is nine.
So, Dylan's weight on the surface of the Earth would be approximately 69 N (620 N divided by 9) if he tripled his distance from the center of the Earth. This means that the gravitational force acting on him would be weaker due to the increased distance from the center of the Earth.
In summary, if Dylan were to triple his distance from the center of the Earth by flying in a spacecraft, his weight on the surface of the Earth would decrease to one-ninth of his original weight, which is approximately 69 N.
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If you double the kinetic energy of a nonrelativistic particle, how does its de Broglie wavelength change? The wavelength Choose your answer here by a factor of Type your answer here [factor answer should be given to one decimal place (ex. 1. 5)]
The de Broglie wavelength of a particle is inversely proportional to its momentum, so if the particle's kinetic energy is doubled. This means that the de Broglie wavelength will be halved, so the factor answer is 0.5.
What is wavelength?Wavelength is the distance between two successive points of a propagating wave which have the same amplitude and phase. Wavelengths are typically measured in meters, centimeters, or nanometers, depending on the type of wave. Wavelengths range from radio waves, which have the longest wavelength, to gamma rays, which have the shortest wavelength. Waves with different wavelengths have different properties like speed, frequency, and energy. Wavelength is an important factor in determining the behavior of a wave, such as its reflection, refraction, interference, and diffraction. Wavelength also determines the type of electromagnetic radiation a wave produces, such as visible light, ultraviolet radiation, or infrared radiation. Wavelength is a fundamental property of waves and is used to describe the properties of light, sound, and other forms of energy.
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Why is it important to change the sampling rate in analog to digital converter?
Answer:
higher sampling rates afford greater overall conversion accuracy
Explanation:
It should be intuitively obvious that higher sampling rates afford greater overall conversion accuracy. Of course, there is a trade-off associated with high sampling rates, and that is the accompanying high data rate. In other words, greater resources will be required to store and process the larger volume of digital information.
If this metal is replaced with a metal having a higher work function, which light would have the best chance of releasing electrons from the metal?.
If a metal is replaced with another metal having a higher work function, it means that the new metal requires more energy for electrons to be released from its surface. In this case, the light that would have the best chance of releasing electrons from the metal would be light with higher energy or shorter wavelength.
According to the photoelectric effect, electrons can be ejected from the surface of a metal when they absorb photons with energy greater than or equal to the metal's work function. The work function represents the minimum energy required to remove an electron from the metal surface.
Based on the relationship between energy and wavelength (E = hc/λ), where E is the energy of a photon, h is Planck's constant, c is the speed of light, and λ is the wavelength of the light, shorter wavelengths correspond to higher energies.
If the work function of a metal is increased (by replacing it with a metal with a higher work function), light with shorter wavelengths (higher energy) would have a better chance of providing photons with sufficient energy to overcome the increased work function and release electrons from the metal's surface.
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A flute is played with a first harmonic of 196 Hz (a pitch of G3). The length of the air
column is 89. 2 cm (quite a long flute). Find the speed of the wave resonating in the
flute.
The speed of the wave resonating in the flute is approximately 349.664 m/s. To find the speed of the wave resonating in the flute, we can use the formula:
speed of wave = frequency x wavelength
We know that the frequency of the first harmonic (or fundamental frequency) of the flute is 196 Hz, which corresponds to a pitch of G3.
To find the wavelength, we need to use the formula for the wavelength of a standing wave in an air column that is open at both ends:
wavelength = 2L/n
where L is the length of the air column (in meters) and n is the harmonic number (for the first harmonic, n = 1).
In this case, we're given the length of the air column as 89.2 cm, which is 0.892 meters. So, plugging in the values, we get:
wavelength = 2 x 0.892 / 1
wavelength = 1.784 meters
Now that we have both the frequency and the wavelength, we can calculate the speed of the wave resonating in the flute:
speed of wave = frequency x wavelength
speed of wave = 196 Hz x 1.784 m
speed of wave = 349.664 m/s
So, the speed of the wave resonating in the flute is approximately 349.664 m/s.
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why do you think it is not wise to hit hard on someone back?
Neglecting air speed, how fast must you toss a ball straight up in order for it to take 6 seconds to return to its initial level?
The initial velocity with which the ball must be thrown upwards in order for it to take 6 seconds to return to its initial level is 29.4 meters/second.
Assuming negligible air resistance, the time taken by a ball to go up and come down after being thrown vertically upwards is given by:
t = 2*v/g
where:
t = time taken for the ball to go up and come down (in seconds)
v = initial velocity with which the ball is thrown upwards (in meters/second)
g = acceleration due to gravity
In this case, the time taken for the ball to return to its initial level is given as 6 seconds. Therefore, we can write:
6 seconds = 2*v/g
Rearranging the equation, we get:
v = (6 seconds * g)/2 = 29.4 m/s
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A person climbs to the top of the tallest mountain in South America. Since they are farther away from the center of the Earth, how does their weight compare to what it was at the base of the mountain?
Answer:
A person's weight will be slightly less at the top of a mountain than at the base. This is because the force of gravity is slightly weaker at higher altitudes. The force of gravity is directly proportional to the mass of the Earth and inversely proportional to the square of the distance between the object and the center of the Earth. Since the person is farther away from the center of the Earth at the top of the mountain, the force of gravity is slightly weaker. This means that the person will weigh slightly less.
The amount of weight loss is very small, and it is not something that most people would notice. However, it is a real effect, and it can be measured. In fact, scientists have used this effect to measure the mass of the Earth.
your group has invented a solar cell that works by applying photosynthesis chemistry to generating hydrogen which is stored for use in a fuel cell. in 10 different regions differing by weather. you set up solar-city installations (using solar cells and lead acid batteries for storage) and your technology comparing the kilowatt hours generated in a month the results are:
The solar cell that applies photosynthesis chemistry to generate hydrogen is different from traditional solar cells that directly convert sunlight into electricity because it uses a chemical process to store the energy generated by sunlight, whereas traditional solar cells directly produce electricity.
In the photosynthesis-based solar cell, the energy from sunlight is used to split water into hydrogen and oxygen through a chemical reaction, and the hydrogen is stored for later use in a fuel cell to generate the electricity. Traditional solar cells, on the other hand, generate electricity by converting sunlight directly into electrical energy through the photovoltaic effect.
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--The complete Question is, How does the solar cell that applies photosynthesis chemistry to generate hydrogen differ from traditional solar cells that directly convert sunlight into electricity? --
Pls. Im falling in class rn
Use the data table that shows the estimation of the daily resting energy expenditure (REE) to explore how calorie requirements change as a person gets older. Follow the steps to calculate the REE for a person over time. Record your calculations in the table. 1. Decide to calculate the REE for a male or female. 2. Choose an adult weight. 3. Calculate the REE for the adult from age 18-29, 30-60, and over 60. Assume the adult maintains the same body weight at each age
We can see that the REE for a female with an adult weight of 150 pounds decreases as she gets older.
To calculate the REE for a person over time, we need to follow these steps:
Decide to calculate the REE for a male or female: Let's assume we want to calculate the REE for a female.
Choose an adult weight:
Let's assume the adult weight is 150 pounds.
Calculate the REE for the adult from age 18-29, 30-60, and over 60. Assume the adult maintains the same body weight at each age.
Using the data table that shows the estimation of the daily resting energy expenditure (REE), we can find the REE for the adult at each age:
Age Male (kcal/day) Female (kcal/day)
18-29 2,400-3,000 2,200-2,400
30-60 2,200-2,600 2,000-2,200
over 60 2,000-2,400 1,800-2,000
Let's use the female column to calculate the REE for the adult female who weighs 150 pounds:
For age 18-29, the REE range is 2,200-2,400 kcal/day.
Let's take the average of the range: (2,200+2,400)/2 = 2,300 kcal/day.
For age 30-60, the REE range is 2,000-2,200 kcal/day.
Let's take the average of the range: (2,000+2,200)/2 = 2,100 kcal/day.
For age over 60, the REE range is 1,800-2,000 kcal/day.
Let's take the average of the range: (1,800+2,000)/2 = 1,900 kcal/day.
Now we can record these calculations in the table:
Age Male (kcal/day) Female (kcal/day)
18-29 2,400-3,000 2,200-2,400
30-60 2,200-2,600 2,000-2,200
over 60 2,000-2,400 1,800-2,000
Therefore, we can see that the REE for a female with an adult weight of 150 pounds decreases as she gets older.
This means that her calorie requirements decrease as she ages, assuming that she maintains the same body weight at each age.
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is the NW section of the Earth experiencing day OR night and winter OR summer in Position 1?
photo is attached below
options:
- day,winter
-night,winter
-day,summer
-night,summer
pls help
The the NW section of the Earth is experiencing night and winter in Position 1.
Option 3 is correct.
What determines when a location experiences day or night?Day and night are due to the Earth rotating on its axis, not its orbiting around the sun.
The term 'one day' is determined by the time the Earth takes to rotate once on its axis and includes both day time and night time. We can predict that the NW section of the Earth is experiencing night and winter in Position 1.
The earth revolves around the sun in an elliptical orbit that takes about 365 1/4 days to finish as it spins on its axis, creating day and night.
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How would an increase in the number of birds affect the number OF mice. Explain ur answer
The relationship between birds and mice is complex and can vary depending on a variety of factors such as the species of birds and mice, the availability of food and habitat, and the presence of predators.
Generally, an increase in the number of birds can have both positive and negative effects on the number of mice. On one hand, birds are predators of mice and can help to control their population by preying on them. Thus, an increase in the number of birds can lead to a decrease in the number of mice.
On the other hand, birds can also indirectly increase the number of mice by providing them with food and habitat. For example, some species of birds such as sparrows and pigeons can create a lot of waste material in their nesting areas, which can attract mice and provide them with a source of food and shelter.
In summary, the relationship between birds and mice is complex and can have both positive and negative effects on each other. An increase in the number of birds can lead to a decrease in the number of mice through predation.
But can also indirectly increase the number of mice by providing them with food and habitat. The specific effects depend on a variety of factors and can vary depending on the situation.
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Two objects of the same mass travel in opposite directions along a horizontal surface. Object x has a speed of 5ms and object y has a speed of 5ms, as shown in the figure. After a period of time, object x collides with object y. In scenario 1, the objects stick together after the collision. In scenario 2, the objects do not stick together after the collision
After the collision, the two objects will stick together and move with a velocity of 5ms in the same direction.
What is collision?Collision is a physical phenomenon that occurs when two or more objects interact with enough force to cause damage to one or more of the objects. This can occur when two objects come into contact with each other, or when two objects are moving at different speeds and collide with each other. Collisions can be caused by a variety of factors, including the speed and mass of the objects, the angle of their contact, and the surface area of the objects.
Scenario 1:
After the collision, the two objects will stick together and move with a velocity of 5ms in the same direction.
Scenario 2:
After the collision, the two objects will bounce off each other and move in opposite directions with the same velocity of 5ms.
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