[填空题]
Suppose David puts a 0.50-kg ry93(u -ie 08fc:nwmuavad.z oock into a sling of length 1.5 msdncf es4+-r : and begins whirling the rock irsn - +dsce4f:n 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
