document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1140414>Question 1140414</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have some questions about resistance and inverse variation. The specific question is \"The electrical resistance R of a wire varies inversely as the square of its diameter d. If a wire with a diameter of 3 millimeters has a resistance of 0.4 ohm, what is the resistance of a wire of the same length if its diameter is 2 millimeters?\" This is on my last test study guide. I have no formula and the one on this site shows Length included in the formula and I don't have a measurement for length. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #760930 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=760930\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> R=k/d^2 is the formula where resistance R is proportional to (constant of proportionality is k) square of diameter d.  Assume length will be the same with both.\r<BR>\n" );
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document.write( "0.4=k/3^2<BR>\n" );
document.write( "0.4=k/9<BR>\n" );
document.write( "k=3.6\r<BR>\n" );
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document.write( "use that in the next part.<BR>\n" );
document.write( "R=3.6/2^2=3.6/4 =0.9 ohms </SPAN>\n" );
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