I need help with this question...(Physics)?

Posted on 2017-04-21 22:07:00 in Physics by MICANI

An 16-cm-long bicycle crank arm, with a pedal at one end, is attached to a 20-cm-diameter sprocket, the toothed disk around which the chain moves. A cyclist riding this bike increases her pedaling rate from 61 rpm to 94 rpm in 12 s . 

A)What is the tangential acceleration of the pedal? 

B)What length of chain passes over the top of the sprocket during this interval?

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