Calculate the mass of a bronze cylinder of radius

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Question- Calculate the mass of a bronze cylinder of radius 9.65cm and length 45.80cm. The composition of the bronze is 79.42% Cu and 20.58% Sn and the densities of Cu and Sn are 8.94g/cm3 and 7.31g/cm3. What assumption should you make in this calculation? Enter your answer in scientific notation.

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