[填空题]
(a) A yo-yo is made of two sol;7l/e 9e-//tottxuqq ltus e -id cylindrical disks, each of maqt 51wh )(rpjh w)of)vulic gpvrnu1h .2 9r81ss 0.050 kg and diameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of mass nri2) h9upo1r8j )51uq( wpg1tfhlv .hvc) wr0.0050 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
