[填空题]
Suppose David puts a *yf8nckmc,oyvt5++l 0.5 ,:k *mhvxlrl;0-kg rock into a sling of length 1.5 m and begins whirli lvrml*,:hx k;ng 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 torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
