[填空题]
Suppose David puts a 0.50-lkr( 8mc :ne(tks8r29a dl6fg kg rock into a sling of length 1.5 m and be swd )qs21kbh(,e-aeigins 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 required to achieve this feat, and where does the torque come from? ae iqb)k,(1-he2wssd $m \cdot N$
Post time 2025-2-18 20:00:22
