[填空题]
A small 650-gram ball on the end of a thin, 0jiuj )kd4jnix;xf- l e) j;q q05k8wulig m9*,rdp(soy,q ckoevn35;l mht rod is rotated in a horizontal circle of radius 1.2 m. Calculqpv9drso,o ,l (ym* c5en3km ;ate (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
