[填空题]
(a) A yo-yo is made of two solid cylindcty+b*k )9o.eyo c- rarical disks, each of mass 0.050 2fn .uj -6gqi1r)d4zsuq zcq7 kg and diameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of mass 0.0050 kg and diameter 0.010 m. Use coq7 d2 .isr1jqzugc)n-4zuq6fnservation of energy to calculate the linear speed of the yo-yo when it reaches the end of its 1.0-m-long string, 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
