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A measuring cylinder contains 20cm^3 of water. When ten identical steel balls are immersed in water the water level
rises to 50cm^3. If one ball has mass of 27g, what is the density of steel in g cm^-3?
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The volume of one ball (of each of the ten identical balls) is = 3 cubic centimeters.
Hence, the steel density is = 9 gram per cubic centimeter.
Solved.