AP Physics B Practice Exam

Category - Introductory Physics

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A balloon is inflated with roomtemperature air and then put in a sunny place. The balloon expands slightly due to a rise in temperature.Which of the following best describes the molecules of air inside the balloon when the balloon is left in the sunlight as compared to when it was first inflated?

The molecules are moving faster.
There are more molecules in the balloon.
There are fewer interactions between the molecules.
The molecules stop colliding with the walls of the balloon.

Explanation

Answer: A - The molecules are moving faster.

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