A book that is on the shelf contains 187 Joules of potential energy and has a mass of 3 kg? How high is the shelf where the book is on?

0.19 m/s and 0.45 m/s

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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