Razia wants to find out the thickness of a single wooden plank in a pile. To do this, she measures the height of the pile of wooden planks and then divides it by the number of planks in the pile .For which of the following piles will her method give the correct thickness of a plank in the pile ?
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You said: Its a well known fact that Moon takes about 30 days (exactly 29.5 days) to complete one revolution around Earth. Are you sure?
Well, that’s not quite right. Strictly speaking, the Moon and Earth orbit each other. The barycenter is the point in space around which two objects orbit. For the Moon and Earth, that point is about 1700 km beneath the earth's surface.
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