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Unformatted text preview: HWCH12
9th Edition CH12 Problems: 3, 25, 45, 81 8th Edition CH12 Problems: 5, 21, 47, 83
3. In Fig. 1226, a uniform sphere of mass m = 0.85 kg and radius r = 4.2 cm is held in place by a massless rope attached to a frictionless wall a distance L=8.0 cm above the center of the sphere. Find (a) the tension in the rope and (b) the force on the sphere from the wall. cylinder A and dB for cylinder B. (c) What is the ratio dA =dB ? 25. In Fig.1237, what magnitude of (constant) force ~ F applied horizontally at the axle of the wheel is necessary to raise the wheel over an obstacle of height h = 3:00cm? The wheel' radius is r = s 6.00 cm, and its mass is m = 0:800kg. 81. A beam of length L is carried by three men, one man at one end and the other two supporting the beam between them on a crosspiece placed so that the load of the beam is equally divided among the three men. How far from the beam' s free end is the crosspiece placed? (Neglect the mass of the crosspiece.) 45. In Fig. 1257, a lead brick rests horizontally on cylinders A and B. The areas of the top faces of the cylinders are related by AA = 2AB ; the Young' moduli of the cylinders are related by s EA = 2EB . The cylinders had identical lengths before the brick was placed on them. What fraction of the brick' mass is supported (a) by cylins der A and (b) by cylinder B? The horizontal distances between the center of mass of the brick and the centerlines of the cylinders are dA for 1 ...
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This note was uploaded on 05/14/2011 for the course ECON 101 taught by Professor Asdaf during the Spring '11 term at Universidad de San Buenaventura Bogota.
 Spring '11
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