[填空题]
A small 650-gram ball)zm ;a(ur6ix9w 22;gcgn m okl6wugv+ owp,g.v3/2c t sas7lu on the end of a thin, light rod is rotated in a horizontal circle of radius 1. 2/pss.wv c3glo ua,t72 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
