[填空题]
(a) A yo-yo is made ofn sc5+ rufruf/ 6xc)d9fmmw; 9:l3ecq two:u++ c5d6bp efggds8j solid 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 6 fu + cj+gdpg5:dbs8eof 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
