[填空题]
Suppose David puts a 0.50-kg ro9e e41 q)frljpck into a sling ofdsq6ny6 u2nl 1 length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a ra qnd66lyn1 us2te 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
