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## Homework Statement

A chainwheel of a bicycle has a radius of .09 m, the radius of the smallest cogwheel (the “highest” gear) is .01 m, and the radius of the rear wheel is .35 m. At what rate (in revolutions per minute) must you be pedaling in order for the bicycle to have a forward speed of 8.33 m/s?

v=8.33

r1=.09

r2=.01

r3=.35

## Homework Equations

v=[itex]\frac{2*pi*r}{T}[/itex]

## The Attempt at a Solution

T=[itex]\frac{2*pi*r}{v}[/itex]

I am unsure what to do when presented with three radii. Am I suppose to average them in order to solve for T?