[填空题]
Suppose David puts a 0.50-kg rocpd)6;6q bn4jbnsnqbz l/y 4:vk in/bvffs ,i o8s;to a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from resibof; 8 v,ss/ft 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
