Kyle and Keion balanced on a seesaw. Kyle's weight is 500 N and Keion weight is 300 N. The seesaw is made of a uniform plank of weight 800 N which is 4 m
long, pivoted at its centre.
By taking moments about the pivot, calculate the distance, that Keion must sit
from the pivot to balance the plank if Kyle sits I m from one end of the plank.

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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