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Q. A flute is designed to play middle C (262 Hz) as the fundamental frequency when all the holes are covered. The length of the flute is 0.655 m. Assume the air temperature is 20°C. How far from the end of the flute should the hole be that must be uncovered to play B above middle C (494 Hz)?

Q. Two freight cars, each with a mass of 2.4 multiplied by 105 kg, collide and stick together. One was initially moving at 3.4 m/s and the other was at rest. What is their final speed?

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