318_Physics ProblemsTechnical Physics

318_Physics ProblemsTechnical Physics - 320 P10.86 Rotation...

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320 Rotation of a Rigid Object About a Fixed Axis P10.86 Call f t the frictional force exerted by each roller backward on the plank. Name as f b the rolling resistance exerted backward by the ground on each roller. Suppose the rollers are equally far from the ends of the plank. For the plank, Fm a xx = 600 2 . N k g −= fa tp bg M mR F FIG. P10.86 The center of each roller moves forward only half as far as the plank. Each roller has acceleration a p 2 and angular acceleration aa pp 2 500 0100 .. cm m a f a f = Then for each, a = +− = ff a tb p 200 2 k g τα = I a p 1 2 10 0 2 . . cm cm . kg cm cm af += So a p F H G I K J 1 2 kg Add to eliminate f b : 21 5 0 = k g (a) And 6 00 1 50 6 00 N . k g k g a p == 750 0800 . . .
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