[填空题]
(a) A yo-yo is made ogfi 1y d1j + 7x-bs2ic4d(xg7frs m,yof two solid cylindr; p-(g +zxk ajjuc2rq u.h:ed6ical 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 speedra cugu6xej+dz(qj2:- .k;ph 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
