[填空题]
Suppose David puts a 0. llz9yt7i6x v150-kg rock into a slifnw) 1 r5uqp0dvr: 6gjng 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 required to acd jp)wvur6 r0q1 g5:fnhieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
