[填空题]
A small 650-gram ball on the end of a thin, m:wp:h chf6n9g1(f xg light rod is rotated in a horizontalxg 6c (9f1g:fmhn:hw pq 9xl9ptae(oig;eif86)hx /pezg 26l circle o9 9 ep 28lz/oxhplf 6xggiei6 eqat;()f radius 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
