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A piece of wood having a specific gravity of 0.65 is 70 mm square and 1.5 m long. How many kg of lead fastened at

A piece of wood having a specific gravity of 0.65 is 70 mm square and 1.5 m long. How many kg of lead fastened at one end of the wood so that it will float upright with 0.30 m projecting out when floating in water?

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