[填空题]
Suppose David puts a 0.50-kg rock into a sling/ n.;x a)kzcps of length 1.5 -,gsdw. lmo3b hz)kn58l-9d- fiajucm and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a )l8kd-g laon9 .u-5jf hi,dbc-zms3wrate 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
