[填空题]
(a) A yo-yo is made of two solid jie:cf g5sz;x+ i +hmt*9v.zh1,luycs;0in v-xn f 7+crbkk9 cylindrical 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 string, if it is releas 1kvys r+ulfx-k n,nc0c9 7bi;ed from rest. $m/s$ (b) What fraction of its kinetic energy is rotational? %
Post time 2025-2-18 20:00:22
