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Q. Two charged dust particles exert a force of 3.2 multiplied by 10-2 N on each other. What will be the force if they are moved so they are only one-third as far apart?

Q. A rectangular barge, 4.0 m long and 1.5 m wide, floats in fresh water. (a) Find how much deeper it floats when its load is a 380-kg horse. (b) If the barge can only be pushed 15 cm deeper into the water before water overflows to sink it, how many 380-kg horses can it carry?

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