[填空题]
Suppose David puts a 0.50-kg rock into a slxl)w 82w(z g+do;sk3yrps ,hma)*a-*fh dorw ing of length 1.5r(3s, 9t7g/n -(c,l i2v fkbu a1f(sqj bzefex 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 rbfnrxl fejqgbu i( 1z7fe(ck2 (s-s9atv,/ 3 ,equired to achieve this feat, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
