[填空题]
Suppose David puts a xppgu4+c-) om0.50-kg rock into a sling of lm2yex.-oih nme(7x(e ength 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 aftex(ey2mn.i(mhe -xe o7r 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
