[填空题]
A small 650-gram ball on the end oq(8md0lp3 (w ;o8aafxk2yo jk f a thin, lighhdwaa.hm1*c- /5sfx u5ir/ rl t rod is rotated in a horizontal circle of radh-w5i u /f5cx./aa1lrs m*rdhius 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
