2008 F = ma Exam — Question 18 — Physics Guide

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F = ma (Final Problems)

Gravitation

FMA-2008-18 · 2008 F = ma (AAPT)

2008 F = ma Exam — Question 18

18. A uniform circular ring of radius R is ﬁxed in place. A particle is placed on the axis of the ring at a distance much greater than R and allowed to fall towards the ring under the inﬂuence of the ring’s gravity. The particle achieves a maximum speed v. The ring is replaced with one of the same (linear) mass density but radius 2R, and the experiment is repeated. What is the new maximum speed of the particle? — Source: Question 18, 2008 F = ma Exam, © 2008 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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