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a 21.00 m steel beam with 6.00 cm x 6.000 cm cross-section is supported at opposite...

a 21.00 m steel beam with 6.00 cm x 6.000 cm cross-section is supported at opposite ends by two wires of equal length but of different composition in diameter. One wire composed of copper has a diameter of .8500 mm The other wire is made of aluminum. If the steel beam remains perfectly level find the diameter of the aluminum wire
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