Question

A student holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. The wheel is subject to some friction, so it gradually slows down. In the 10-s period following the inital spin, the bike wheel undergoes 77.5 complete rotations.

student holds a bike wheel and starts it spinning with an initial angular speed of 9.0 rotations per second. ne wheel is subject to some friction, so it gradually slows down. In the 10-s period following the inital spin, the bike wheel undergoes 77.5 complete rotations. Assuming the frictional torque remains constant, how much more time Ats will it take the bike wheel to come to a complete stop? Number The bike wheel has a mass of 0.825 kg and a radius of 0.385 m. If all the mass of the wheel is assumed to be located on the rim, find the magnitude of the frictional torque that was acting on the spinning wheel. Number N- m

Answer 1

Now Given data are The tog rotations/s t = To see. 0 = 77.5" Sor we know that The © = Wot + obať put the valuel 47 = 9X10 - s xxx(to). 7.5 = gon' soxca go-77 de do o* s osas reale - oigs rad - Ja sor 9 - 10x0.25 0.25 and the find the magnitude Torgue T - IL put The values T = 0.895 % (0.388) yoo 28x2 IT T= 0:192 imt