[填空题]
(a) A yo-yo is made of twiowe a;y)v zf 3q;-:fcs u;oy*o solid cylindrical disksszo r(/i* t oypc)f :np1ln5:c, each of mass 0.050 kg and diameter 0.075 m, joined by a (concentric) thin s 1o (nsit )z/5:ccr*fnlo:ppyolid 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
