[填空题]
Suppose David puts a 0.50-kg rock iq --kdfzxma cw(60a)1 j mz;rz-7 sbvvnto a sling of lengdwl)p(+ ktxt it; 6y/l3m8 dnrth 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. Whatw+pt) mdtnt/d l6;(y l83kxri 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
