[填空题]
Suppose David puts a 0fm k+1.w 0iq )frbz7g9f. gyuj.50-kg rock into a sl o m+i0hc:lb,qing of length 1.5 m and begins 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 required to achieve this feat, and where do,cm0 hb:lo+iqes the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
