Question

A 5.0-kg box at the top of a 400cm ramp slides down 200 cm. How much gravitational potential energy was lost as the box slides from the top of the ramp to the 200 cm mark of the ramp?

A cheerleader is thrown vertically upward into the air. As the cheerleader rises, which one of the following qualities increases?

a. gravitational potential E.
b. speed
c. kinetic E.
d. acceleration
e. mechanical energy

Answer 1

d.because she will be accelerating as she goes up..

Answer 2

Actually, I believe the answer is c - kinetic energy. Kinetic energy is energy that is in use, and as she rises, that is what is happening.

It wouldn't be choice a because she is moving. (Potential energy is energy that has not yet been used.)

Answer 3

Oops, I didn't fully read the question. We are looking for the quality that increases.

As the cheerleader rises, the kinetic energy is decreasing.

Potential energy is increasing because as she goes up, she will reach a point where she is not moving. The potential energy will be greatest at that point. It is rising as she approaches it, so the answer should be choice a.

Answer 4

Is the 400cm and 200cm refer to vertical height? Or ramp length.

GPE= mg*vertical height change.

As the cheergirl goes into the air, her GPE increases.

Answer 5

ITS ALL OF THE ABOVE!

Answer 6

it's (A). As the cheerleader is thrown upwards, speed and kinetic energy is lost. As mechanical energy is the sum of both kinetic and potential energy, this is taken out of the question. The cheerleader will also be decelerating, so acceleration is not the case. Therefore, the cheerleader gains Gravitational Potential Energy.

Answer 7

idk man