[填空题]
Suppose David puts a 05fqcre o8u0ws 8h85 he.50-kg bk8rnb:i 9u9k sm.i +xrock into a sling of length 1.5 m and begins whirling the rock in a nearly horizontal circle above his head, accelerating it from rest to a iu rmkb s:9xb+9i .k8nrate 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
