[填空题]
A small 650-gram ball on the end of a t b )ezj59d:f;yvc sc4/m(b eoi4mpz l)hin, lir :n1mm 1 4md :vl,owc6a.mazhnos:i ;ght rod is rotated in a horizontal circle.,:mdma o : mv cnwzi1aom :sl4;r16hn 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
