[填空题]
Suppose David puts a 0.50-kg rock into a sling of le ch4 6od 9qm,6zdvds0dngth 1.5 m and begins whd;e(2z- z 40-fjxue: iwz cgcrirling the rock in a nearly horizo(drgxej- u2w:z; c i40f-ezzc ntal 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
