2020 F = ma Exam B — Question 20 — Physics Guide

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FMA-2020B-20 · 2020B F = ma (AAPT)

2020 F = ma Exam B — Question 20

A well-calibrated scale reads zero when nothing is placed on it. When a deflated balloon is placed on the scale, it reads mg. When a non-airtight box is placed on the scale, it reads M g, where M > m. The balloon is inflated with helium, so that it floats upward in air. The balloon is placed in the box, and the box is placed on the scale. If the scale reads W , which of the following is true? — Source: Question 20, 2020 F = ma Exam B, © 2020 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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