[填空题]
Suppose David puts a 0.50-kg rock il2qfb af,:) q q(qd2nxnto a stxfl hqqc 0-tqr v:8a* f-1f0qling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from restl8x 0rq-:0 qa*tvqh-1ff qfc t 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
