document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1191874>Question 1191874</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The wheel of a truck is making 280 rpm. Find the speed of the automobile in kilometers per hour if the radius of the wheel is 0.9m. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #823724 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=823724\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the radius of the wheel is .9 meters.<BR>\n" );
document.write( "the circumference of the wheel is 2 * pi * r = 2 * pi * .9 = 1.8 * pi meters.<BR>\n" );
document.write( "that's equal to 1 revolution of the wheel.<BR>\n" );
document.write( "multiply that by 280 and you get 504 * pi meters in one minute.<BR>\n" );
document.write( "a kilometer is equal to .001 * 1 meter.<BR>\n" );
document.write( "504 * pi meters is equal to .001 * 504 * pi meters which is equal to .504 * pi kilometers.<BR>\n" );
document.write( "since pi = 3.141592654 then .504 * pi kilometers is equal to 1.583362697 kilometers.<BR>\n" );
document.write( "that's in 1 minute.<BR>\n" );
document.write( "multiply that by 60 to get 95.00176184 kilometers per hour.<BR>\n" );
document.write( "that should be your answer.<BR>\n" );
document.write( "fyi:<BR>\n" );
document.write( "since 1 kilometer is equal to 0.621371 miles, then the truck is traveling at 59.03133976 miles per hour.<BR>\n" );
document.write( "this is not an unreasonable speed. </SPAN>\n" );
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