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Q. To measure the weight of the cat, a person places a 100N box and a 60N box from the ends of a uniform pole that is pivoted at its center. The system balances when the cat stands at a point 1/4 of the rods length from the 60N box. What is the approximate mass of the cat?

Q. You are standing between two speakers that are separated by 72 m. Both speakers are playing a pure tone of 277 Hz. You begin running directly toward one of the speakers, and you measure a beat frequency of 12 Hz. How fast are you running?

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