Space Time & Motion A.2 Forces & Momentum (id: 9e12d26cd)

本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学

[单选题]

A toy of mass mm is attached to a rod of length L and undergoes circular motion in the vertical plane. The radial force F of the rod is constant.

What is the ratio of the linear speed at the top to the linear speed at the bottom of its path, $\frac{v_{top}}{v_{bottom}}$

A. $\frac{F-mg}{F+mg}$
B. $\frac{F+mg}{F+mg}$
C. $\sqrt{\frac{F-mg}{F+mg}}$
D. $\sqrt{\frac{F+mg}{F-mg}}$


参考答案:  D


本题详细解析:

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