[填空题]
Suppose David puts a 0.50-kg rock in ,xf(ip6hz a-sto a +ah(ik1xo 1)jzdwty j 2ji-0psling of length 1.5 m and begins whirling the ro) 2o j-k +y01t pdj1hijiwaz(xck 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, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
