[填空题]
(a) A yo-yo is made of two solid cylindrical disku;2qy0lfh/ qzzd e 6m0s, each of mass 0.050 kg fljbyrd;)0lq;+9 f.(vh l akcand diameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of mass 0.0050 kg and diameter 0.010 m. Use conservation of energy to calculate the linear speed of the yo-yo when it reaches the end of its 1.0-m-long strifhv ld .(r;)jlbq9kyl 0fc+;ang, if it is released from rest. $m/s$ (b) What fraction of its kinetic energy is rotational? %
Post time 2025-2-18 20:00:22
