51. A cylinder with moment of inertia I (about its center) that is initially not rotating, falls onto and sticks to a spinning cylinder with moment of inertia 21 (about its center) as shown. Calculate the fraction of rotational kinetic energy lost during this process (fraction lost = (Ki Kf) / Ki). a) 0 b) 1/2 c) 2/3 d) 1/3 e) 1/4 I 21 -not spinning

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.