[填空题]
A small 650-gram ball on the end of a thin,z )6xkh 7tvgt g: c+rq,m9le)q light rod is rotated inpm1c: w(2 :cyx6lb zin a horizontal circle of radius 1b1ccyl(:m nwzxi p6 2:.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
