[填空题]
Suppose David puts a 0.50-kg rock iw ;kft f o 5daxi4ep91bsh.4 uz,qnvr8baa:;2kn x (;efzvd;*nto 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 torque requ*e (f;zxkvn;dired to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
