[填空题]
Suppose David puts a 0.50-krf+izgfef 3:ng-/f y- g rock into a sling of aihr3yi z+un 3gosq .a7r:/+c 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 tqrzsc: .rah+/ 7y3u +3inaigoo achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
