[填空题]
A small 650-gram ball o j/zen(ax*q xqink36l;x7q7 qn the en n;/o9* mgl 7bqapqac:d 7fyshw/92cfd of a thin, light rod is rotated in a horizontal circle of radius 1.2 m. 9y:cbl/;co a9*qa7f spqnfg2mh7d/w 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
