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Show steps to solve this problem. 1) A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg,

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1) A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 40.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child. How long is the beam

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