[填空题]
(a) A yo-yo is made of two solid cyl1vaz)upah: 6 0rs5vf ,g2o labi m*i,jind -rr9 rt: 6rsnypg-u/prical disks, each 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 conu- r6rr :try 9pnp/s-gservation 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
