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Q. Two sound waves, from two different sources with the same frequency, 495Hz, travel in the same direction at 339m/s. The sources are in phase. What is the magnitude of the phase difference of the waves at a point that is 7m from one source and 3.69m from the other?

Q. Three stars, each with the mass and radius of our sun, form the equilateral triangle 5.0×109 {rm m} on a side. If all three are simultaneously released from rest, what are their speeds as they crash together in the center?

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