At rest the cars horn sounds at a frequency of 455 hz. the, Ask an Expert

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Q1. At rest, the car's horn sounds at a frequency of 455 Hz. The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car's speed hears a frequency of 427 Hz. What is speed of the car?

Q2. A planet has two satellite moons. Moon X has an orbital period of 1.62 days. Moon Y has an orbital period of about 3.35 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet's mass is 0.10 x 10^27 kg.

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