[填空题]
Suppose David puts a jz x.).kd, qn,vad7tu0.50-kg rock into a sling of length 1.5 mlzu b sqs9c;v90c+0v v 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 torquevqucl0v+bcs 9sv0z9 ; required to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
