A bicyclist of mass 66 kg puts all his mass on each downward

A bicyclist of mass 66 kg puts all his mass on each downward-moving pedal as he pedals up a steep road. Take the diameter of the circle in which the pedals rotate to be 0.45 m, and determine the magnitude of the maximum torque he exerts.

Number / Units ?

Solution

SOLUTION:

The torque is nothing but the dot product of force and radius.

Here Force= F= mg= 66*9.81= 647.46 N

Radius= 0.45/2 = 0.225 m

Hence Torque = F*r = 647.46*0.225 = 145.6785 N.m