Final answer:
Periodic functions repeat values at regular intervals and can model various situations like flag height on a windmill, baseball height post-hit, and a ball suspended from a spring.
Explanation:
Periodic functions are functions that repeat their values at regular intervals. Examples of situations that can be modeled by periodic functions include the height of a flag on a windmill, the height of a baseball after it has been hit, and the height of a ball suspended from a spring. These situations exhibit a recurring pattern over time or space, making them suitable for representation using periodic functions.
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