2003q9.m28.071

2003q9.m28.071 - MEEG 2003 Quiz #9.m28 Two drums C and D...

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MEEG 2003 Quiz #9.m28 Two drums C and D are rigidly fastened together and are free to rotate about the bearing at O as shown. The value of s µ is 0.11 between the belt and the smaller drum D and 0.20 be- tween the belt and the larger drum C . Determine the mini- mum magnitude min P of the applied vertical force needed to lift the 120-lb block A up from the ground. Hint . Consider the cases: (a) slipping between belt and drum D is assumed to impend, (b) slipping between belt and drum C is assumed to impend. ------------------------------------------------------------------------------------------------------------------------------
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