Space Time & Motion A.2 Forces & Momentum (id: 125c53fdf)

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 box is sliding down an 5hvl 3gwjg u9lx+cr- 6incline at x /6m ujl69blva constant speed of $2\,ms^{−1}$. The angle of the incline is $\theta$.



The magnitude of the total of the opposing forces is $16\,N$. What is the force of gravity acting on the box?

A. $\frac{8}{sin \theta}$
B. $\frac{16}{sin \theta}$
C. $\frac{8}{cos \theta}$
D. $\frac{16}{cos \theta}$


参考答案:  B


本题详细解析:

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