A2.3kg box, starting from rest, is pushed up a ramp by a 10 n force parallel to the ramp. the ramp is 2.0 m long and tilted at 17 degrees. the speed of the box at the top of the ramp is 0.80m/s. how much work does the force do on the system? what is the change in the kinetic energy of the system? what is the change in the gravitational potential energy of the system? what is the change in the thermal energy of the system?

Part a)

Part b)

Part c)

Part d)

Explanation:

Part a)

Work done by the applied force is given by the formula

here we know that

Part b)

As we know that the box was at rest initially and then it is moving with speed 0.80 m/s

so here we can say

Part c)

Change in gravitational potential energy is given as

Part d)

Now by energy conservation law we can say that

Work done by external agent = change in kinetic energy + change in potential energy + thermal energy lost

so we have

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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