[填空题]
(a) A yo-yo is made of twk;5nck3g 5r4airfr e7o solid cylindrical disks, each of mass 0.050 kg a8cf0 jy -*pv:.wn-i:a ivc3sia xmf(u nd diameter 0.075 m, joiijv fmu.(s3icwxn8a0:: a- -yfc p iv*ned 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 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
