[填空题]
Suppose David puts a 0.50-kg rock into a sling of length 1.gpp5+ v oso rr5 -6r1z6shzqi95 m and beswdv54 lxng8 6)gzqmaf,:cck i 1 2,wggins 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 requ2wzc,lfd s)in6cm4k,:g xw vqgg58a 1ired to achieve this feat, and where does the torque come from? $m \cdot N$
