[填空题]
(a) A yo-yo is made of two solid cylindrical disks, eac 2r8r6klmu0o bh of mass 0.050 kg and dilkmb0 ror68 u2dtwu j9m rab 168q2aj*ameter 0.075 m, joined by a (concentric) thin solid cylindrical hub of mass 0.0050 kgra8 dwu*jab612qtj9 m 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
