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What is the smallest number of whole logs (ρ = 725 kg/m3, radius = 0.0615 m,...

What is the smallest number of whole logs (ρ = 725 kg/m3, radius = 0.0615 m, length = 3.30 m) that can be used to build a raft that will carry four people, each of whom has a mass of 63.0 kg?

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we need at least 24 logs to make the raft.

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