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Question: 5 it is proposed to build a raft of pine...

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5. It is proposed to build a raft of pine logs for carrying a cargo on a river. The cargo will weigh 500 kg, and it must be kept entirely above the water level. How many kilograms of pine logs must we use to make the raft, if the logs may be entirely submerged, and they have SG 0.80? Answer 2000 kg

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