[填空题]
A small 650-gram ball on the eeybac0x p49;a ;l v(yond of a thin, light rod is rotatedkjb5x m:kds 6cd,d 0-pqy9q0 o in a horizontal circle of radibd9qq5dx j6 k 0pks ,m0ydo:-cus 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
