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Q. An athlete at the gym holds a 1.8-kg steel ball in his hand. His arm is 74-cm long and has a mass of 4.00 kg. What is the magnitude of the torque about his muster if he holds his arm straight out, parallel to the floor?

Q. Water flows over Victoria Falls that is 128 m high, at an average rate of 1.2x10^6 kg/s. If one fourth the potential energy of this water were converted to electric energy, how much power would be produced by these falls?

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