[填空题]
(a) A yo-yo is made of two solid v t)j f3q*bckp-+ c,-ptqs lc) 4q4vy, 3tqeyrcylindrical disks, each of mass 0.05rri+ a cuqy;qs + 5er+0+er3zqa 4z9yk0 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 ra k3+aqie45+zquzq ecy 0y+s;rr9rr +eleased from rest. $m/s$ (b) What fraction of its kinetic energy is rotational? %
Post time 2025-2-18 20:00:22
