Abodybuilder loads a bar with 550 newton’s (125 pounds) of weight and pushes the bar over her head 10 times. each time she lifts the weight 0.5 meters. how much work did she do?

3.2x10^7

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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there are no contact forces mentioned on the list of choices that you've provided.