[填空题]
(a) A yo-yo is made of two solu io.v*: v9mrt t6o:ldid bzt6; 9c.agx,i 3n nd:e7 itktcylindrical disks, each of mass 0.050 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 conservation of energy t:6b9 z,73 txc;.gad eiiknntto 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
