PHYSICS HIGH SCHOOL

An elevator is initially moving upward at a speed of 12.60 m/s. The elevator experiences a constant downward acceleration of magnitude 3.60 m/s2 for 2.97 s.

Answers

Answer 1
Answer:

I'm assuming you're asking for the elevator's final velocity.

Consider the following equation:

Vf = Vi + aΔt

Vf is the final velocity.

Vi is the initial velocity.

a is the acceleration.

Δt is the amount of elapsed time.

Given values:

Vi = 12.60m/s

a = -3.60m/s²

Δt = 2.97s

Substitute the terms in the equation with the given values and solve for Vf:

Vf = 12.60 - 3.60×2.97

Vf = 1.91m/s

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the difference between an electric motor and an electric generator is that a motor converts _____ energy into ______ energy, while a generator converts _______ energy into ________ energy

Answers

Answer:electrical,kinetic,kinetic,electrical

Explanation:

Answer:

Electrical, kinetic, kinetic, electrical

Explanation:

Just did it

Calculate the average power required to lift a 490 Newton object of vertical distance of 2 m in 10 seconds

Answers

             Power  =  (work done) / (time to do the work)

             Work  =  (force) x (distance)

If you want to lift a 490N object, you'll need (at least) 490N of force.
So, when you lift it 2 meters vertically, the work you do is

             Work  =  (490 N) x (2 m)  =  980 joules
and
             Power = (980 joules) / (10 sec)  =  98 watts .  
                 

What happens during a muscle contraction

Answers

Answer:

What happens during a muscle contraction?

During a muscle contraction, the sliding of the filaments pulls the Z discs of a sarcomere closer together, then shortens the sarcomere. This is when muscle contraction happens!

Hope this helps! :)

Please mark brainliest

a soap film is viewed in white light. if the film is much thinner than the wavelength of blue light, what is the appearance of the film?

Answers

When a soap film is viewed in white light and the film is much thinner than the wavelength of the blue light, the film will seem to be totally transparent. The thin film will reflect no visible light. It actually depends on the thickness of the film through which the light is being transmitted. I hope the answer helps you.

Imagine that you are sitting in a closed room (no windows, no doors) when, magically, it is lifted from Earth and sent accelerating through space with an acceleration of 1g (9.8 m/s2). According to Einstein's equivalence principle, which of the following is true?You won't feel any change and will have no way to know that you've left the earth.
You'll feel a force that will cause your head to repeatedly bang into the ceiling.
You'll know that you left the Earth because you'll be floating weightlessly in your room.
You'll know that you left the Earth because when you drop a ball it will fall sideways.

Answers

Answer:

You won't feel any change and will have no way to know that you've left the earth.

Explanation:

One of the formulations of the principle says that the properties of an inertial system under the effect of a gravitational field are the same as a non-inertial(accelerated) system. The inertial system under the effect of a gravitational field occurs when you are in the room on earth, and when the room is sent accelerating through space you have the non-inertial system. Both have the same properties, so it's impossible to tell the difference if you can't look outside.

An object is dropped from a height H above the ground. This free-falling object requires 1.02 s to travel the last 39 m before hitting the ground. From what height H above the ground did the object fall?

Answers

Answer:

H = 95.3 m

Explanation:

Let the height from which object fall down is H

so the total time to fall is given as

H = (1)/(2)gt^2

now it cover 39 m in last 1.02 s of its path

H - 39 = (1)/(2)g(t - 1.02)^2

so now we have

(1)/(2)gt^2 - 39 = (1)/(2)g(t - 1.02)^2

by solving above equation

t = 4.41 s

Now the total height is given as

H = (1)/(2)gt^2

H = (1)/(2)g(4.41)^2

H = 95.3 m
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