# Answer on Mechanics | Relativity Question for Jason Ranak

Question #5132

The pedals of a bicycle rotate in a circle with a diameter of 50cm. What is the maximum torque a 75kg rider can apply by putting all of her weight on one pedal?

Expert's answer

The rider applies a force F = mg when she puts all the weight on the

pedal.

Using the formula: torque = r*F, where r is the distance from the axis

(radius = d/2), we get:

torque = m*g*d/2 = 75*9.8*0.5/2 = 183.75 (H*m).

pedal.

Using the formula: torque = r*F, where r is the distance from the axis

(radius = d/2), we get:

torque = m*g*d/2 = 75*9.8*0.5/2 = 183.75 (H*m).

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