[填空题]
Suppose David puts a cv f ecx./ubln7(0mr40.55r( 4m drayrw-0-kg rock into a sling 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 torqa yw-m4 r(d5rrue required to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
