[填空题]
(a) A yo-yo is made of two solid cylindrical disk (y,ehbm:-uzbrgw /1 jk)r2wxs, each of mass 0.050 kg andr kpf:hr15 spfne*:y( diameter 0.075 m, joined by a (conc: k:* rf(pe1phsnyfr5 entric) 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
