[填空题]
(a) A yo-yo is made of two solid cylindrical daqd* bvliygh,fz0 blbv28q * 8l-6-mj isks, each of.7he ro3+yjzm4 zukvd8 .-eil mass 0.050 kg and diameter 0.075 m, joined by a (concentric) thinze kju..7e3 4lmzv+hiyo r-d8 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
