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Scientific Skills & Tools (id: 6621ead3c)

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admin 发表于 2024-2-15 10:40:24 | 显示全部楼层 |阅读模式
本题目来源于试卷: Scientific Skills & Tools,类别为 IB物理学

[单选题]
A stream flows east with a speed $v_s$. A boat points due south and moves with a speed $v_o$ relative to the water.



The ratio $\frac{v_o}{v_s}=\frac{1}{2}$
Which of the following is correct about the magnitude in $ms^{-1}$ and the angle $\theta$ between the velocity of the boat and the side of the stream?



A. Magnitude is $\sqrt{3}v_o\:\theta\:is \sin^{-1}(\frac{1}{2})$
B. Magnitude is $\sqrt{3}v_o\:\theta\:is \cos^{-1}(\frac{1}{2})$
C. Magnitude is $\sqrt{5}v_o\:\theta\:is \tan^{-1}(2)$
D. Magnitude is $\sqrt{5}v_o\:\theta\:is \tan^{-1}(\frac{1}{2})$


参考答案:  D


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