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Q. While combing your hair, you scuff off electrons from your hair onto the comb. Is your hair after that positively charged or negatively charged? How about the comb?

Q. A satellite is placed between the Earth and the Moon, along a straight line that connects their centers of mass. The satellite has an orbital period around the Earth that is the similar as that of the Moon, 27.3 days. How far away from the Earth must this satellite be placed?

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