A 517kg piano is on the first floor that is 2.4m high. You lift it up and carry it to the 4th floor that is 19m above the ground. How much work did you when you carried the piano from the 1st floor to
the 4th floor?

we need to know the time interval during which the force acts. impulse of force = momentum change

force tends to be low and long diustance masses are high

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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