[填空题]
Suppose David puts a 0.50-kg rock tgxk-su:d; mjevy1jw) 4 l5o .inzcd.(d vi/n;2 2rky ynto 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. What is the torque kizcy2n/y rd(;.2dnvrequired to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
