A wooden board that is 50 cm long 20 cm long and 4 cm thick, Ask an Expert

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A wooden board that is 50 cm long, 20 cm long, and 4 cm thick is floating in water. Rocks are then carefully placed on the top face of the board until the top of the wood just slips below the water surface. The density of water is 1000 kg/m^3 and the density of the wood is 600 kg/m^3. What is the total mass of the rocks?

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