[填空题]
A small 650-gram ball on the end of a e/v (/r+ppxnk ;fr kxakvt 0f/cr r0+2thin, light rod is rotated sr3:b m1udt(j ig/e139 facorin a horizontal circle of radius 1.er ubjas 1od3(t1 gicm/: 3fr92 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
