document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=955268>Question 955268</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car has wheels with a radius if 42.0 cm. If the car is travelling at a speed of 90.0 km/h, what is the frequency of rotation of its wheels? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #583597 by </B><A HREF=/tutors/aboutme.mpl?userid=Theo><B>Theo(13342)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Theo><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=Theo><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=583597\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> if the radius is 42 centimeters, then the circumference is 2 * pi * 42 = 263.8937829 centimeters.\r<BR>\n" );
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document.write( "there are 100 centimeters to a meter and 1000 meters to a kilometer.\r<BR>\n" );
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document.write( "the number of centimeters in a kilometer is therefore equal to 100 * 1000 = 100,000.\r<BR>\n" );
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document.write( "if the car is traveling at 90 kilometers per hour, then the car is traveling at 90 * 100,000 centimeters per hour.\r<BR>\n" );
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document.write( "90 * 100,000 centimeters per hours is equal to 9,000,000 centimeters per hour.\r<BR>\n" );
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document.write( "since the circumference of the tire is equal to 263.8937829 centimeters, then the tire has rotated 9,000,000 / 263.8937829 revolutions per hour.\r<BR>\n" );
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document.write( "9,000,000 / 263.8937829 is equal to 34,104.63066 revolutions per hour.\r<BR>\n" );
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document.write( "that's the frequency of rotation of the wheels.\r<BR>\n" );
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document.write( "the tires rotate 34,106.63066 times per hour when the car is traveling at 90 kilometers per hour.\r<BR>\n" );
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document.write( " </SPAN>\n" );
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