document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=937869>Question 937869</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose you can ride a bicycle a distance of 5 miles in 15 minutes. If you ride at a constant speed and if the bicycle's wheels have diameter 27 inches, find the wheels' approximate rate of turn (in revolutions per minute) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #571273 by </B><A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><B>TimothyLamb(4379)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=TimothyLamb><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=TimothyLamb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=571273\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> linear speed of bike:<BR>\n" );
document.write( "s = linear speed<BR>\n" );
document.write( "d = distance<BR>\n" );
document.write( "t = time<BR>\n" );
document.write( "s = d/t <BR>\n" );
document.write( "s = 5/15<BR>\n" );
document.write( "s = (1/3) mile/minute<BR>\n" );
document.write( "s = (1/3) mile/minute * (5280 ft/mile) * (12 inches/ft)<BR>\n" );
document.write( "s = 21120 inches/minute<BR>\n" );
document.write( "---<BR>\n" );
document.write( "wheel parameters:<BR>\n" );
document.write( "c = circumference<BR>\n" );
document.write( "r = radius<BR>\n" );
document.write( "d = diameter<BR>\n" );
document.write( "c = 2*pi*r<BR>\n" );
document.write( "c = pi*d<BR>\n" );
document.write( "c = 3.1415*27<BR>\n" );
document.write( "c = 84.8230016469 inches<BR>\n" );
document.write( "note that one revolution = c arc length along the road<BR>\n" );
document.write( "---<BR>\n" );
document.write( "angular speed of wheel (rate of turn):<BR>\n" );
document.write( "rpm = s/c<BR>\n" );
document.write( "rpm = (21120 inches/minute) / (84.8230016469 inches)<BR>\n" );
document.write( "rpm = 248.989066526<BR>\n" );
document.write( "---<BR>\n" );
document.write( "answer:<BR>\n" );
document.write( "249 rev/minute<BR>\n" );
document.write( "---<BR>\n" );
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document.write( "--- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );