[填空题]
Suppose David puts a: wlri: kq()xssyawxz-.5k5 t 0.50-kg kn7pre6kb)g+ rock into a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerabn67e) kk rp+gting 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
