[填空题]
A small 650-gram balsz 3j n,r/wqz ./q6 ah)3sdewgl on g5:t y3 bq d2w:w8odmkthe end of a thin, light rod is rotated in a horizontal3bdmq2w:wogt:8dk y5 circle 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
