Space Time & Motion A.2 Forces & Momentum (id: 9347c0c9a)

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 200g ball is moving in a h5wvqr 7* yde/yorizontal circlyqxvxcvh3g /47*u*dve shown with the dotted path in the diagram. The diamvg/* vv hx*4c dqxu37yeter of the bowl is 40 cm and the angular speed is $4\pi rads^{-1}$

What is the magnitude of the ball's centripetal acceleration?

A. 0.64$\pi^2 rads^{-2}$
B. 3.2$\pi^2 rads^{-2}$
C. 6.4$\pi^2 rads^{-2}$
D. Cannot be determined with the given information.


参考答案:  D


本题详细解析:

$\underline{\text{Explanation}}$: 
The radius of the circular path is smaller than the radius of the bowl and no information is given to calculate it, therefore answer is D.

$\underset{‾}{\text{Further Explanation}}$: 
In the distractors, calculating centripetal force with 20 $cm$ radius, the answer is A. 
In the distractors, calculating centripetal acceleration with 20 $cm$ radius, the answer is B. 
In the distractors, calculating centripetal acceleration with 40 $cm$ radius, the answer is C.

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