Problem 23P

A person exerts a force of 55 N on the end of a door 74 cm wide. What is the magnitude of the torque if the force is exerted (a) perpendicular to the door, and (b) at a 45° angle to the face of the door?

Solution :Step 1The time period of oscillation of a simple harmonic motion is given by, displacement T = acceleration = 2 ax