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Q. A 3.0 m long rigid beam with a mass of 120 kg is supported at each end. An 85 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?

Q. A uniform 165-N bar is supported horizontally by two identical wires A and B (the figure ). A small 185-N cube of lead is placed 3/4 of the way from A to B. The wires are each 75.0cm long and have a mass of 5.50 g.

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