[填空题]
Suppose David puts a 0.50-kg rock ue3het nc7d*) intor )lhakb 5j(d. a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle abkbr5.h(d laj )ove 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
