An 8.0-kg history textbook is placed. on a 1.25-m high desk. How large is the gravitational potential energy of the textbook-Earth system relative to the desk?

a, c, d, e are all applying about success strategies.

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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i'm on my way to history not a mistory.