2023 F = ma Exam — Question 23 — Physics Guide

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F = ma (Final Problems)

Gravitation

FMA-2023-23 · 2023 F = ma (AAPT)

2023 F = ma Exam — Question 23

An astronomer on Earth, which is a distance L⊙ from the Sun, observes a star and galaxy. The star is a distance Ls ≫ L⊙ away, and the galaxy is much further away than the star. Throughout the year, the angular distance between the star and galaxy appears to vary, reaching a minimum of 2 arcseconds on January 1st and a maximum of 2.5 arcseconds on July 1st. (One degree is equal to 3600 arcseconds.) Assume the Sun, star, and galaxy do not move relative to each other, and that the Earth’s orbit lies within their plane. What is the ratio Ls /L⊙ ? 2 arcsecond 2.5 arcsecond galaxy star star galaxy — Source: Question 23, 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.

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