[填空题]
A small 650-gram ball on the end of a thin, light vl 9-eaou (i8;php8wnrod is rotated pelz 90n:6q.jr 1m 2.usanahnin a horizontal ciqlu:m6an.sr.ezanj 1h np 9 20rcle of radius 1.2 m. Calculate (a) the moment of inertia of the ball about the center of the circle, $kg \cdot m^2$ (b) the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.020 N on the ball. Ignore the rod’s moment of inertia and air resistance. $m \cdot N$
Post time 2025-2-18 20:00:22
