masses m and 2m is (1) S and that between the mass m and the surface is (2) S . You hold the third mass M stationary and the release it. You observe that both masses begin to move together. What is the relationship among m, M and (2) S for motion to begin? What is the relationship be- tween the coe¢ cients of static friction (1) S and (2) S for both m and 2m to move together?

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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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