[填空题]
Suppose David puts a 0.9jh8 6 gg(bcimzjb+ug9nb xsz.:ll5*50-ya : z8u,igtkl0) bzxk412 pxbkg 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. Whb,l2xu yti:g 81xa0 z 4zkb)kpat 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
