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Coefficient of static friction between shoes

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The 80-lb boy stands on the beam and pulls on the cord with a force large enough to just cause him to slip. If the coefficient of static friction between his shoes and the beam is (?1s)p = 0.4, determine 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.

1538_thickness of the beam.jpg

Reference no: EM13878497

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