試題詳解

42. A uniform stick 1.0 m long with total mass 15 kg rests on a firictionless table and is pivoted at its end. The uniform stick rotates freely about this pivot. A bullet with a mass of 10 g and a speed of400 m/s strikes the center of the stick, in a direction perpendicular to tiie stick and embeds itself there. Find the stick' s angular speed.

(A) 0.1 rad/s
(B) 0.4 rad/s
(C) 0.6 rad/s
(D) 02 rad/s
(E) 0.8 rad/s