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Q. A wooden raft has a mass of 81 kg. When empty it floats in water (density 1000 kg/m3) with 64% of its volume submerged. What mass of sand can be put on the raft without it sinking?

Q. Suppose the speakers are reconnected so that the 530 Hz sounds they emit are exactly out of phase. At what positions are the intensity maximum and minimum now?

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