[填空题]
Suppose David puts a 0.50-kg rock into a sling of length 1.5 m a6q pt d z(c+ob 2ndl8lezaa99.nd begins whi5rg.xn b 0xt.erling 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 torquebx rg 05enx..t come from? $m \cdot N$
Post time 2025-2-18 20:00:22
