[填空题]
(a) A yo-yo is made of two solid 5t4waq.- j 0tu.nk ladisp;k1cylindrical disks, each of mass feja pp1s 2/wg-8uy1 qe/z5 az0.050 kg and diameter 0.075 m, joined by agzuf /ejz p2 1y-wpa/58qase1 (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
