[填空题]
A small 650-gram bal3bk q5e)* v9a.xwux4joq qq p+l o4o n 7s :pm)3.6znhoczk.hjc zn the end of a thin, light rod is rotated in a horizontal circlc p:hso.j73ch6nk4 om z z.z)ne of radius 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
