Explain the process of mechanical energy exchange during oscillations of a pendulum. As the pendulum falls, is converted into . When the pendulum reaches the bottom of the swing, all of its energy is composed of . When the pendulum rises, is lost and is gained. At the top of the swing, all of its energy is composed of , just as at the start of the swing.

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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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