[填空题]
A small 650-gram ball on thewa9k2i*ixb2b en 3pz. a,be9eexqj)8r+cufk 1du,g* qsd of a thin, light rod is rotated in a horizontal circle of radiuuxa+ebg)f 8p s,.de9*kr,1 j cz3uqe qs 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
