[填空题]
A small 650-gram ball on the end +;a vu65(o1dkv0oa lidj woza vv0j 14of a thcr g./v :dl;f ghqup:f*s.f g9in, light rod is rotated in a horizontal circle of radius 1.2 m. Calcul.hgfq* gfg: v ;/fcrpd.s:u 9late (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
