[填空题]
A small 650-gram ball opub aozo ( *ac8j27,nnn the end of a thin, light rodl0.9 v+yh84sppfltp 2s;ck bs is rotated in a horizontal circle of radius 1.2 m9 .ltpkl s 0c;2h8pss4f b+vyp. 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
