Raft for children

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

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

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