Arope and pulley system is used to lift a box that weighs 90 newton’s. how much force do you need to pull on the rope if the machine has a mechanical advantage of 5?

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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