[填空题]
Suppose David puts a 0.50-kg rock ikb/,spflsc mj08z j,h9(y-gi nto a sling of lrp .uzu0x m( ,iys36nlength 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 required to achieve this feat, and where does the torque come froi0yp l.nzsu ,mx6 (3rum? $m \cdot N$
Post time 2025-2-18 20:00:22
