[填空题]
(a) A yo-yo is made of two solid cyi-mfugj zeb +xx:*7*xzwfw r6g0)mn 1lindrical disks, ,tlfnccx;.6j fpm 7 9jd4 )hnieach of mass 0.050 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,n94 7cfic m)hjjn, f;dtxlp6. 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
