2023 F = ma Exam — Question 15 — Physics Guide

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F = ma (11–17)

Gravitation

FMA-2023-15 · 2023 F = ma (AAPT)

2023 F = ma Exam — Question 15

The following plot shows the speed v(r) at which stars orbit about the center of a galaxy, as a function of their distance r from the center. v(r) r Assuming the galaxy has a spherically symmetric mass distribution, which plot best shows the mass of the galaxy M (r) enclosed within radius r? M (r) M (r) — Source: Question 15, 2023 F = ma Exam, © 2023 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.

AP Physics 1 and AP Physics C (Mech) problems are adapted from OpenStax College Physics for AP® Courses 2e and University Physics Volume 1, © OpenStax (Rice University), licensed under CC BY 4.0. Problem text is reproduced exactly; correct answers come from the OpenStax answer keys. For written-answer problems, the incorrect answer choices were written by Physics Guide. Physics Guide is not affiliated with or endorsed by OpenStax or the College Board.