HW21-S07

HW21-S07 - Cylinder A and block B are attached to cords...

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AEM 264-002/921 Homework #21 4/30/07 Due: Wednesday, 5/2/07 Correct units and a reasonable number of significant digits (3 or 4) are required for every problem solved in every homework assignment in this section of AEM 264. 1. The uniform 8.05-lb bar AGB is attached to two collars of negligible weight/mass that slide with negligible friction along fixed rods. An external force P acts to the right on collar A as shown. If the velocity of block A is i s ft v A r r + = 0 . 2 and the acceleration of block A is 0 = A a r , find the magnitude of the force, P the reaction force exerted by the fixed rods at A and G. Note that this is NOT a work-energy problem! 2. The double pulley shown below has a mass of 14 kg and a radius of gyration of 165 mm.
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Unformatted text preview: Cylinder A and block B are attached to cords wrapped around the pulleys as shown. The coefficient of kinetic friction between block B and the surface is 0.25. The system is released from rest. Use the work-energy method to find: the velocity of cylinder A when it strikes the ground, then the total distance that block B travels before coming to rest. Note that once the mass A strikes the ground it no longer participates in the work or energy portions of the problem. Problem 17.11 of Vector Mechanics for Engineers - Dynamics, 7 th Ed....
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