document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1208118>Question 1208118</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A circular disc of cast iron is 7 ft. in diameter and 1 1/3 in. thick. Determine weight.  \r<BR>\n" );
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document.write( "A plate 1 ft. square and 1 in. thick weighs 37.5 lbs.\r<BR>\n" );
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document.write( "Area of circle:  pi * r^2.\r<BR>\n" );
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document.write( "Not sure how to solve. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #846301 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13203)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=846301\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "The methods shown by the other tutors are fine.<br><BR>\n" );
document.write( "Here is another....<br><BR>\n" );
document.write( "Start with the 37.5 pounds that the plate, 1 foot square and 1 inch thick, weighs.<br><BR>\n" );
document.write( "The cross sectional area of the plate is 1 square foot.<BR>\n" );
document.write( "The cross sectional area of the disc is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28pi%29%28r%5E2%29=%28pi%29%287%2F2%29%5E2=%2849%2F4%29pi ALIGN=MIDDLE  ALT=\"%28pi%29%28r%5E2%29=%28pi%29%287%2F2%29%5E2=%2849%2F4%29pi\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "The cross sectional area of the disc is greater than the cross sectional area of the plate by a factor of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2849%2F4%29pi ALIGN=MIDDLE  ALT=\"%2849%2F4%29pi\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "The thickness of the plate is 1 inch; the thickness of the disc is 1 1/3 inches.<BR>\n" );
document.write( "The disc is thicker than the plate by a factor of 1 1/3 = 4/3.<br><BR>\n" );
document.write( "Multiply the weight of the plate by the factors by which the cross sectional area and thickness of the disc exceed those of the plate:<br><BR>\n" );
document.write( "ANSWER: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2837.5%29%28%2849%2F4%29pi%29%284%2F3%29 ALIGN=MIDDLE  ALT=\"%2837.5%29%28%2849%2F4%29pi%29%284%2F3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 612.5pi = 1924 to the nearest whole number.<br><BR>\n" );
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