Rotational Dynamics (id: d19244776)

本题目来源于试卷: Rotational Dynamics，类别为 美国物理杯赛(Physics Bowl)

[单选题]
14.39: Two uniform disks,Xnf9p pz(riiib8r-h oi+ 0 *p)j andY, ha jh17.mmmaig0 +sab6a ve masses $m_x$<$m_y$, equal radii, and equal initial non- zero kinetic energies. Each disk rotates counterclockwise in the plane of the page about a fixed frictionless axis through its center. As shown in the figure, a force F is applied tangent to each disk at its right edge for the same amount of time. After the forces are applied, let L represent the magnitude of the angular momentum about the center of a disk and K represent the kinetic energy of a disk. Which one of the following choices correctly compares these quantities for disk X anddisk Y?

A. $L_x> L_y;K_x<K_y$
B. $L_x> L_y;K_x>K_y$
C. $L_x= L_y;K_x= K_y$
D. $L_x< L_y;K_x<K_y$
E. $L_x< L_y;K_x>K_y$


参考答案:  E


本题详细解析: 暂无

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