Question three boys with mass 28 35 and 40 kg build a raft, Ask an Expert

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Question: Three boys with mass 28, 35 and 40 Kg build a raft joining logs of 20 cm diameter and 2m of length each, in order to use it.

Part A: How many logs must unite to float so that the logs be submerged completely and flush with water?

I need help to solve the above question and consider that the wood density is 788 kg/m³.

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