2010 F = ma Exam — Question 23 — Physics Guide

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FMA-2010-23 · 2010 F = ma (AAPT)

2010 F = ma Exam — Question 23

23. Two streams of water ﬂow through the U-shaped tubes shown. The tube on the left has cross-sectional area A, and the speed of the water ﬂowing through it is v; the tube on the right has cross-sectional area A′ = 1/2A. If the net force on the tube assembly is zero, what must be the speed v′ of the water ﬂowing through the tube on the right? Neglect gravity, and assume that the speed of the water in each tube is the same upon entry and exit. — Source: Question 23, 2010 F = ma Exam, © 2010 American Association of Physics Teachers (AAPT) and the U.S. Physics Team. Adapted by PhysicsTrainer: reformatted into a separate question and answer choices for online multiple-choice practice; any shared setup from nearby questions is repeated here. Not affiliated with or endorsed by AAPT or the U.S. Physics Team.

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F = ma problems are © the American Association of Physics Teachers (AAPT) and the U.S. Physics Team, the original source, and are used with permission. Problems shown here are adaptations: they have been reformatted by Physics Guide into separate question and answer-choice pieces for online multiple-choice practice. Physics Guide is an independent student project and is not affiliated with, endorsed by, operated by, or supported by AAPT, F = ma, USAPhO, or the U.S. Physics Team.

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