[填空题]
Suppose David puts a 0.50-kg rock into a slingwc ral+ x;:s 0u9odjqqp.y /*tx *c gq/3dvxe1hc*tr,of length 1.5 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 required to achieve this fea*e/,q *vhcc3g rxdt1xt, and where does the torque come from? $m \cdot N$
Post time 2025-2-18 20:00:22
