How much work is required to stack one on top of another

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Q. A 3-m-long rigid beam with a mass 120 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam?

Q. Eight books, each 9.0 cm thick with mass 1kg, lie flat on a table. How much work is required to stack them one on top of another?

Reference no: EM1392946

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