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One cubic meter (1.00 m3) of aluminum has a mass of 2.70 × 103 kg, and...

One cubic meter (1.00 m3) of aluminum has a mass of 2.70 × 103 kg, and the same volume of iron has a mass of 7.86 × 103 kg. Find the radius of a solid aluminum sphere that will balance a solid iron sphere of radius 2.00 cm on an equal-arm balance.
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