### Calculate the density of the rock

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##### Reference no: EM13261036

(1) A small piece of rock is weighed in air and then weighed while immersed in oil of density 800 kg/m3. If the weight in air is 21.5 N and the weight in the oil is 11.8 N, calculate the density of the rock.

(2) A 15 meter length of steel with a cross-sectional area of 20 cm2 is compressed with a force of 10,000 N. If the
Young's modulus of steel is 200 *10^9 N/m2, what is the change in length of the steel beam?

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