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Q. Aluminum has a density of 2.7 103 kg/m3 and a molar mass of 27 g/mol. The Hall coefficient of aluminum is R = -3.0 10-11 m3/C. What is the number of conduction electrons per aluminum atom?

Q. A centrifuge rotor has a moment of inertia of 3.40 10-2 kg·m2. How much energy is required to bring it from rest to 8000 rpm?

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