Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately .60 m) 10 times in one minute; Ben lifts the 50 kg barbell the same distance over his head 10 times in 10 seconds. Which student does the most work? Which student delivers the most power? Explain your answers.

Answers

Answer 1

Answer:

Final answer:

Both students do the same amount of work, but Ben delivers more power due to completing the work in a shorter time.

Explanation:

In this case, both Ben and Bonnie are lifting the same 50 kg barbell over their heads, but they are doing it at different rates. Bonnie lifts the barbell 10 times in one minute, which means she is doing the work over a longer period of time. Ben, on the other hand, lifts the barbell 10 times in 10 seconds, doing the work in a shorter amount of time.

The amount of work done is equal to the force exerted multiplied by the distance moved. Since the mass and distance are the same for both students, the work done is equal. However, power is defined as the rate at which work is done, which is calculated by dividing the work done by the time taken to do it. Since Ben completes the work in a shorter period of time, he delivers more power than Bonnie.

Therefore, Ben does the most work and delivers the most power.

Learn more about Work and Power here:

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Answer 2

Answer:

Answer:

Both of them

Explanation:

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What characteristics of EM waves did you discover?

Answers

The characteristics of electromagnetic waves typically represent as follows:

There are changes in the electric and magnetic fields simultaneously so that both fields have maximum and minimum values at the same time and place.
The direction of the electric field and the magnetic field are perpendicular to each other. The direction of both is perpendicular to the direction of the wave propagation.
The shape of electromagnetic waves is transverse waves.
It has general wave characteristics like polarization, reflection, refraction, interference, and diffraction.
The amount of the electric field (E) is directly proportional to the magnitude of the magnetic field, with the relationship E = cB.
The universal constant of the velocity of electromagnetic waves in a vacuum is $\boxed{ \ c = 3 * 10^8 \ m/s. \ }$
The speed at which electromagnetic waves propagate depends merely on the electrical and magnetic properties of the medium that it travels on.
Because electromagnetic waves do not contain an electric charge, they do not experience any possible deviation in the electric or magnetic fields.

Further explanation

Two physicists who contributed significantly to developing the concept of electromagnetic waves are Faraday and Maxwell around 1831-1864.
From the observations, Faraday suggested that changes in the magnetic field cause an electric charge to flow in the loop of wire, contributing in the emergence of an electric field.
Maxwell proposed a reverse process, which is a change in the electric field will generate a magnetic field.
As follows, according to Faraday's Law, changes in sinusoidal magnetic fields generate electric fields which also change sinusoidally.
Meantime, according to Maxwell's Hypothesis, changes in sinusoidal electric fields generate magnetic fields which also change sinusoidally.
Furthermore, there is a process of combining electric and magnetic fields that propagate in all directions called electromagnetic waves.

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Keywords: the characteristics, electromagnetic waves, transverse, vacuum, electric fields, magnetic, perpendicular, propagation, Maxwell, Faraday, the speed, polarization, reflection, refraction, interference, and diffraction

Answer: reflection

Refraction

Energy

Speed

Explanation:

Reflection results when em wave hits a plane surface and returns in the same angle it incident

Refraction is the change in velocity and direction of em wave as it crosses boundaries of different medium

The energy of em wave is evenly distributed in electric field and magnetic field

The speed of em wave is the same as 3×10^8

two pendulums of lengths 100cm and 110.25cm start oscillating in phase. after how many oscillations will they again be in same phase?

Answers

Angular frequency of pendulum is given by

$\omega = \sqrt{(g)/(l)}$

for both pendulum we have

$\omega_1 = \sqrt{(9.81)/(1.00)}$

$\omega_1 = 3.13 rad/s$

For other pendulum

$\omega_2 = \sqrt{(9.81)/(1.1025)}$

$\omega_2 = 2.98 rad/s$

now we have relate angular frequency given as

[tex\omega_1 - \omega_2 = 3.13 - 2.98 = 0.15 rad/s[/tex]

now time taken to become in phase again is given as

$t = (2\pi)/(\omega_1 - \omega_2)$

$t = (2\pi)/(0.15) = 41.88 s$

now number of oscillations complete in above time

$N = (t)/((2\pi)/(\omega_1))$

$N = (41.88)/((2\pi)/(3.13))$

$N = 21 oscillation$

What is gravitational field?

Answers

is region where magnetic fields are strong

There is little vertical air movement in the __ because of the cold, heavy air at the bottom of the layer.

Answers

The correct answer is the Mesosphere. Mesosphere is the layer of the Earth's atmosphere that is directly above the stratopause and directly below the mesopause.

Answer:

The correct answer is the Mesosphere. Mesosphere is the layer of the Earth's atmosphere that is directly above the stratopause and directly below the mesopause.

Explanation:

A glass is semifilled with liquid water and place in a room at 20 oc. after some time, part of the water evaporates. what happened to the average kinetic energy and the average potential energy of the water particles that escaped to the gas phase?

Answers

Water is placed at room temperature at 20 degree C

now after some water evaporate at room temperature

so here we can say speed of water molecules will not change as the temperature is same after evaporation

as we know that total kinetic energy is given by

$KE = (f)/(2) nRT$

since temperature is same then energy will not change here

now as water evaporate to vapors then we can say that here all molecules are separated more in vapor phase so force of interaction will be less in this phase

And since potential energy depends on the force so potential energy will decrease in this phase

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