[填空题]
Suppose David puts a 0.50-kg rock into a -wxt nw(kej)s 2ox,)asgw;nw .f 62otyedjq yb); p9;oling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his 2ef; pj.b;qwy6 y wdg9)oton;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
