本题目来源于试卷: Angular Momentum,类别为 美国物理杯赛(Physics Bowl)
[单选题]
09.42: A uniform, soli w h gge:+p(z6gd disk with mass tw jx4gmfy 3mm7 :9-os dw9kt-M and radius R is rotating on a fixed, frictionless platform with constant angular speed ω0 about a fixed axis through its center. A second uniform w3 7-mjo4xfgdtyk :mt9m w9-s solid disk of mass 2M and radius R/2 is placed from rest directly on top of the first disk so that the centers of the disks line up. When equilibrium is established, the disks are spinning at the same rate. What is the angular speed of the disks at equilibrium?
A. $\frac{1}{4}w_0$
B. $\frac{1}{3}w_0$
C. $\frac{1}{2}w_0$
D. $\frac{2}{3}w_0$
E. $\sqrt{\frac{2}{3}}w_0$
参考答案: D
本题详细解析:
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