[填空题]
A small 650-gram ball on the end of a thin, light3at:h t yh+;efvbp4a -(gj*d.a6yfn f7/jz 6b;h:fgq ud3mzt rod is rotated in a horizontal circle of radius 1.2 m. Cal:zuf b aj 6/67d3n mzhyqf.;fgculate (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
