A bicycle is being pedaled up a hill by rider weighing 140 l

A bicycle is being pedaled up a hill by rider weighing 140 lbs. Given that pedal shaft is 14 inches long, find the magnitude of the torque vector about the center of the pedal axle P at the instant when the shaft makes an angle of 10 degrees with the horizontal, and the rider is standing with all his weight on the one pedal. torque =

Solution

Torque t = r * F sin(q)      ; q is the angle between the force with pedal

              = 14 inch * 140 * sin(80) = 14 * 0.08333 ft * 140 lb * 0.984 = 160.713 ft.lb