[填空题]
Suppose David puts a ;r-zi+ emwu2 g0.50-kg rock into a slin l3o 9bnpt4;.oc(vc3e9j qmc (stvnk- delh+ +g 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 required to achieve this feat, and where9e ltjc3- km4nco(+l h pq3n; v+bte.9s(d cov does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
