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Q. Two sound speakers separated by a distance of 3-meters, are driven in phase by the same audio amplifier. A listener sits directly in front of one speaker at a distance of 4 meters from it so that the listener and speakers form a right triangle

Q. Suppose a bar 2.5 m long expands 0.2 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated?

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