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Below a metal beam of length 8m rests on a pivot at 2m from the right end. To balance the weight of the metal beam,

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Below a metal beam of length 8m rests on a pivot at 2m from the right end. To balance the weight of the metal beam, two metal posts have been attached. The metal post on the right has a mass of 300kg and is 50cm from the right end. The metal post on the left has a mass of 500kg and is 1.5m from the right end. What is the mass of the metal beam? (Answer: 350kg)

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