The length ofa bicycle pedal arm is 0.178 m, and a downward force of 140 N is applied to the pedal by the rider. What is the magnitude of the torque about the pedal arm's pivot when the arm is at an angle of (a)13.4, (b) 90, and (c) 180 with the vertical? (a) Number I Units 4. (b) Number a Units 4} 1} (c) Number l Units A uniform spherical shell of mass M = 6.70 kg and radius R = 0.630 m can rotate about a vertical axis on frictionless bearings (see the gure). A massless cord passes around the equator of the shell, over a pulley of rotational inertia l = 0.0850 kg-m2 and radius r = 0.120 m, and is attached to a small object of mass m = 2.80 kg. There is no friction on the pulley's axle; the cord does not slip on the pulley. What is the speed of the object when it has fallen a distance 1.50 m after being released from rest? Use energy considerations. Q? Number I Units