[填空题]
(a) A yo-yo is made of rr6 s2oxpu/5u two solid cylindricao bntnrl;lu z5ks;i0(f):m d: l disks, each of mass 0.050 kg and diameter 0.075 m5 o 0bun:zik(sl)nl; ;tdfrm:, 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 released from rest. $m/s$ (b) What fraction of its kinetic energy is rotational? %
Post time 2025-2-18 20:00:22
