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document.write( "A length of pipe is to be made from 100 lbs. of lead. Determine length of pipe.\r
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document.write( "Description of pipe:\r
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document.write( "Diameter: 3/4 in.\r
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document.write( "Thickness: 1/8 in.\r
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document.write( "Lead weighs 2/3 lbs. per cu. in.\r
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document.write( "Let l = length.\r
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document.write( "Unsure how to proceed.
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document.write( "1. From one side, the volume of lead is V = 
= 
= 150 cubic inches.\r\n" );
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document.write( "2. From the other side, the volume of the solid body which is formed by the wall of the pipe, is \r\n" );
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document.write( " V = 
- 
, \r\n" );
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document.write( " where D = 
in is the outer diameter, d = 
= 
= 
= 
in is the inner diameter.\r\n" );
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document.write( " So, V = 
\r\n" );
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document.write( " = 
= 
= 
.\r\n" );
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document.write( "3. Therefore, you have an equation\r\n" );
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document.write( " = 150.\r\n" );
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document.write( " Solve it for L, the tube length:\r\n" );
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document.write( " L = 
= 
= 611.46 inches.\r\n" );
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document.write( "Answer. 611.46 inches.\r\n" );
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document.write( "![\"\"](\"/images/stars/stars-13.gif\")
