[填空题]
(a) A yo-yo is made of two solid cub,1fe aobt2 -t, 2ilhylindricedk ,a 7vzrf9 r7c6v7ltx2gi*(xm r(aal disks, each of mass 0.050 kg and diameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of catv7g vfeira x( 29krlx(m 7*7z6r,dmass 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
