[填空题]
A small 650-gram ball on the end of a thin, ligu;xcb4w+7z 2mzj+y5o n m dt*pht rod is rotated in a horiz:0t;woy aj- pr:)gg6 crzn d2vv5kct7kt m,7sontal circle of radius2t z7)os0-7t :gpmr:nk 5t cjvagydr vc,;6kw 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
