[填空题]
(a) A yo-yo is made of two sof3v 2bl9tnj me +v(. irefas/ija1e5 *lid cylindrical disks, each of masst9hdjtv:x tffh)kd20 y(1f7s 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 oft1dtfk h d:s)(tfx0hf92jy 7 v 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
