[填空题]
(a) A yo-yo is made of two solid cyuoro/i0bx)56e u,dg mlindrical disks, each of mass i9tr *y4pgrq5 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 to calculate the linear speed of the yo-yo when it reaches i5tgp q9*ry4r 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
