320 Rotation of a Rigid Object About a Fixed AxisP10.86Call ftthe frictional force exerted by each rollerbackward on the plank. Name as fbthe rollingresistance exerted backward by the ground oneach roller. Suppose the rollers are equally farfrom the ends of the plank.For the plank,Fmaxx∑=6002. Nkg−=fatpbgMmRFFIG. P10.86The center of each roller moves forward only half as far as the plank. Each roller has acceleration ap2and angular accelerationaapp25000100..cmmafaf=Then for each,a∑=+− =ffatbp2002kgτα∑=Iap1210 02..cmcm.kgcmcmaf+=SoapFHGIKJ12kgAdd to eliminate fb:2150=kg(a)And 6 001 506 00N . kgkgap==7500800...
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