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A French submarine and a U.S. submarine move toward each other during maneuvers in motionless water...

A French submarine and a U.S. submarine move toward each other during maneuvers in motionless water in the North Atlantic (see the figure). The French sub moves at 50 km/h, and the U.S. sub at 59 km/h. The French sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5470 km/h. What is the signal's frequency as detected by the U.S. sub?

What frequency is detected by the French sub in the signal reflected back from the U.S. sub?

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