[填空题]
A small 650-gram ball on the end3rziq81l t,swf jvu (4 of a thin, light rod is rotated in a horizontas59 bj/xv5 watmrsj1 ;sve2 p41xt-wzl circle of 2svwre1 9/s; 1btp5 vx5a4j x-mjwztsradius 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
