Raft for children

Two children, each weighing 534 N, 534 \text{ N,} make a log raft by lashing together logs. Each log has a diameter of 0.30 m 0.30 \text{ m} and a length of 1.80 m. 1.80 \text{ m}. How many logs will be needed to keep them afloat in fresh water?

The density of the logs is 800 kg/m3 800 \text{ kg/m}^3 .
The density of fresh water is 1000 kg/m3. 1000 \text{ kg/m}^{3}.

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