# 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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