[填空题]
Suppose David puts a 0.50-kg rock intk*z ar8ibk;y6 atu* ,ym8ig1vo a sl;vyjhc2 awjb 0it vd1 6tb,:ps.e b)8ving of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a:dtb v2ba; ie.v0p ,cjhbvw86sy1)jt 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
