document.write( "Question 451569: The resistance of a wire to the transmission of electricity varies directly as the length of the wire and inversely as the square of the radius of a cross section of the wire. An 800m has a radius of 0.48cm and ha a resistance of 0.3125 ohms. if another wire made from the ame metal has a length of 500 m and a resistance of 0.5 ohms, what is the radius? \n" ); document.write( "
Algebra.Com's Answer #310510 by stanbon(75887)\"\" \"About 
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The resistance of a wire to the transmission of electricity varies directly as the length of the wire and inversely as the square of the radius of a cross section of the wire.
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\n" ); document.write( "r = kL/r^2
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\n" ); document.write( "Solve for \"k\" using \"An 800m has a radius of 0.48cm and ha a resistance of 0.3125 ohms\".
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\n" ); document.write( "0.3125 = k*800/(0.48)^2
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\n" ); document.write( "k = 0.00009
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\n" ); document.write( "Equation:
\n" ); document.write( "r = 0.00009L/r^2
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\n" ); document.write( "If another wire made from the same metal has a length of 500 m and a resistance of 0.5 ohms, what is the radius?
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\n" ); document.write( "r = 0.00009*500/(0.5)^2
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\n" ); document.write( "r = 0.18 ohms
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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