[填空题]
(a) A yo-yo is made of two solid cylindrical vi -+ il8j/a*ykrgf0zdisks, each of mass 0.050 kg and diy jz0*k+v8fa /l ri-gijp8o fs6r;/v:xl ry9fameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of mass 0.0050 kg and diameter 0.010 m. Use conlo pv9 y 8r6rjfxf:/;sservation 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
