While pedaling a bicycle, a particular cyclist exerts an 80N force against the pedal. This  force is tangent to the circle traced by the pedal during each stroke. If the diameter of  the circle traced by each pedal is 36cm, calculate how much work is done in each  stroke. (Assume that the 80N force is constant throughout the entire stroke – i.e. one  foot pushes, the other doesn’t and vice versa).

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