[填空题]
Suppose David puts a 0.50-kg rock ik/6o::fruqmqk b9q +k nto a sling of length 1.5 m and begins whirltqxn0s-ur 3dedqh1 gd w:5/ 4cv x5*ining the rock in a nearly horizontal circle above his head, accelerating it from re*q i 4eh/n5wgud53x0d qxsr1v nt:c-dst 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
