9. Given the setup of the experiment, derive an expression for the coefficient of kinetic friction using the energy model of an isolated system. Be sure to specify what object(s) make up your
system and show all work algebraically.
di
d2

true

explanation:

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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