[填空题]
Suppose David puts a 0.50-kg rock into a sling of lengtn9gx m(z/.u l9cqz agmnhi(.;ib4+s eh 1.5 m and begin tly0d,w10vsp kz/s.ss whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a rate of 120 rpm after 5.0 s. What is the torque requir.dvk0ps0 ,tlz/s 1ywsed to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
