There is a clever kitchen gadget for drying lettuce leaves after you wash them. it consists of a cylindrical container mounted so that it can be rotated about its axis by turning a hand crank. the outer wall of the cylinder is perforated with small holes. you put the wet leaves in the container and turn the crank to spin off the water. the radius of the container is 13.2 cm. when the cylinder is rotating at 1.70 revolutions per second, what is the magnitude of the centripetal acceleration at the outer wall?

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 already answered it by 34/s