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

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... show more 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?
2 answers 2