[填空题]
Suppose David puts a 0.50-kg rockt,3qe.m ;+e 6xlx hpot int6xi : dfe/bjy6xjd q(1o a sling of length 1.5 m and begins whirling the rock in a nearly horizontal cixx yd1ejdb/ :q(f ij66rcle above his head, accelerating it from rest to a rate of 120 rpm after 5.0 s. What is the torque required to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
