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Q. A swimmer wears a heavy belt to make her average density exactly equal to the density of water. Her mass, including the belt, is 60 kg. What is the swimmer's volume in m3? What is the simmer's weight in Newtons?

Q. An electric wire that has a mass of 5.0kg for a 20 m length is strung between two poles 20 m apart. What must be the tension in the wire if it is to take 0.80 seconds for a pulse to travel along the wire from one pole to the other?

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