[填空题]
Suppose David puts a 0upzxbfoov317y 1h l+4.50-kg rock into a sling :fmi(i04ej;myg 1 numof length 1.5 m and begins whirling the rock in a f4mm 0n1uej(ym ii g:;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 does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
