[填空题]
Suppose David puts a 0.50-kg roc( o6-u:0d5 dr ebhezy2hvf m)gk s0e -)a*1nx1rbl j arl:p1x7qt8kiyn into a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle jsr0rn) n yilxe 1bt1p q1a87ka*l-x: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
