document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1182045>Question 1182045</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I don't know where to start here so any help is appreciated. Thanks!\r<BR>\n" );
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document.write( "A car owner decides to upgrade from tires with a diameter of 24.3 in to tires with a diameter of 26.1 in. If she doesn't update the onboard computer, how fast will she actually be traveling when the speedometer reads 65 mph? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #812009 by </B><A HREF=/tutors/aboutme.mpl?userid=htmentor><B>htmentor(1343)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=htmentor><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=htmentor><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=812009\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The onboard computer calculates the linear speed from the <BR>\n" );
document.write( "rotational speed and the assumed radius of the tires<BR>\n" );
document.write( "The linear speed is given by v = w*R, where w = the rotational speed, R = the radius<BR>\n" );
document.write( "The assumed linear speed = v1 = 65 mph = w*R1, where R1 = the assumed tire radius<BR>\n" );
document.write( "The actual speed = v2 = w*R2, where R2 = the actual radius<BR>\n" );
document.write( "So the ratio of the speeds is just the ratio of the radii.<BR>\n" );
document.write( "v2 = (26.1/2)/(24.3/2)v1 = 1.074*v1 = 1.074*65 = 69.81 mph<BR>\n" );
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