[填空题]
Suppose David puts a c1shm ;vw*/ yt0.50-kg rock i-c slj 1e*hthb8:zb1muaj2d + nto a sling of length 1.5 m and begins whirling 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 rems hjuhl1:b2*1ez8atc+ d jb-quired to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
