問題詳情
9. A record is dropped vertically onto a freely rotating (undriven) turntable. Frictional forces act to bringthe record and tumntable to a common angular speed. If the rotational inertia of the record is 0.54 timesthat of the turntable, what percentage of the initial kinetic energy is lost?
(A) 10%
(B) 35%
(C) 18%
(D) 46%
(E) 60%.
參考答案
答案：B
難度：計算中-1
書單：沒有書單，新增