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An oil slick that has a density of 930kg / m ^ 3 floats on water....

An oil slick that has a density of 930kg / m ^ 3 floats on water. A rectangular block of wood 4.00cm high and with a density of 960kg / m ^ 3 floats partially in oil and partially in water. The oil completely covers the block. How far below the contact surface between the two liquids is the bottom of the block?

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