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3. A uniform 25 N beam 6 m long is carried by two men A and B, one at each end of the beam. a) If A exerts a force of 20 N, where must a load of 45 N be placed on the beam? b) What force does B exert? 4. A 3 m long weightless beam is supported at each end by cables. A painter weighing 900 N stands 1 m from the left cable. Calculate the tension in each cable