[填空题]
(a) A yo-yo is made r 2vcp2m6ir1acrb a-mm*7va fst,54 kof two solid cylin-v:scui(h; t+pz51nrgox g,qdrical 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 to calculate the linear speed of the yo-yo when it reaches the end of its 1.0-m-long stringuig z(,r5qt-n o;:sp +hc1 gvx, 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
