[填空题]
A small 650-gram ball mu ;1, zqo4itn5bmru2on th 4mpur7/fh; *wd , rtn(yvx(kge end of a thin, light rod is rotated in a horizontal circle of raddrr *vt4 (gx/(hmnuky;f7pw,ius 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
