A roll of paper is rolled on the floor in such a way that it is leaving paper on the behind it as it rolls. The paper left behind remains stationary on the floor. The roll is given an initial velocity V= 7.5 m/s. The initial radius of the roll is R = 1 m. Find the velocity of the roll Vf in m/s, when the radius of the roll is r = 0.6 m. Assume the roll rolls without slipping and that gravity acts on the roll. Also assume that the mass distribution of the paper on the roll is homogeneous. (Take g = 10 m/s^2)

a=d/t

a="triangle"v/t

explanation:

a = acceleration

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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