[填空题]
A small 650-gram ball on the end of a thin, light rod is rotated j.2l9 bub k7ubz u*hr m7+dd9gin a horiz . ihtke4iwi2ls-f; e2g8nz+ dontal circle of radiu2w ek ideih+2;ift4g-zls. n8s 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
