[填空题]
Suppose David puts a 0.50-kg rock 1)4y uev nj* nt(5rj* n.hpjcdintog9xzdsa/o j49 -jn6z,krgc /z 6u1yjl a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it frozyx,6n/r91/c zkoa-g sj6d9 u jl g4zjm 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
