[填空题]
Suppose David puts a 0.50-kg f3 (dpdnoqi.8kp2 pi2rg q f,c3vw4fx:ock into 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 required to achieve this feat, andx4w :gc 3fv,qf where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
