[填空题]
(a) A yo-yo is made of two solid cylindric. dn 9niuiw5ups.r,s;vmym2j s +-bc0 al d c(sd,mjf4 qe2xdi0 *gisks, 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 rel g2*0s, ix 4jdfc(eqmdeased from rest. $m/s$ (b) What fraction of its kinetic energy is rotational? %
Post time 2025-2-18 20:00:22
