Question: The 80-lb boy stands on the beam and pulls with a force of 40 lb. If (? s ) D = 0.4, determine the frictional

The 80-lb boy stands on the beam and pulls with a force of 40 lb. If (?_s)_D = 0.4, determine the frictional force between his shoes and the beam and the reactions at A and B. The beam is uniform and has a weight of 100 lb. Neglect the size of the pulleys and the thickness of the beam.

13 12 D. 5ft -3 ft -4 ft 1 f'

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