[填空题]
Suppose David puts a 0.50-kg rock into a sling of lenkr+ i 1d hjgp 3vxh)8s/lezl-r 3(ssu)gth 1.5c n+j1 lfag;()gjfv/yw;q5mr 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 required to achieve this feat, and where does the gj ;njf+ m;ay vq)fl51g/r(wc torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
