document.write( "Question 1210251: I iron pipe has a cross section, the iron being 1cm thick. The mass of 1cm3 of cast iron is 7.2g. Calculate the mass of a 2metre length of the pipe \n" ); document.write( "

Algebra.Com's Answer #851747 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "I iron pipe has a cross section, the iron being 1cm thick.
\n" ); document.write( "The mass of 1cm3 of cast iron is 7.2g.
\n" ); document.write( "Calculate the mass of a 2metre length of the pipe
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document.write( "To solve the problem, multiply the cast iron density of 7.2 g/cm^3 by the volume of the metal.\r\n" );
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document.write( "To find the volume of the metal, multiply the cross-section area of the pipe by its length\r\n" );
document.write( "in consistent units.\r\n" );
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document.write( "To find the area of the cross-section of the pipe, from the greater area of the circle subtract \r\n" );
document.write( "the area of the smaller circle.\r\n" );
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document.write( "To find the areas of circles in cross-section, the radii or diameters are needed \r\n" );
document.write( "(since the thickness of the pipe is given, any one of the two radii/diameters should be given).\r\n" );
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document.write( "But neither radius nor diameter of the pipe is given in the post, making the problem like \r\n" );
document.write( "a three-leg horse.\r\n" );
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\n" ); document.write( "\n" ); document.write( "I am very disappointed by inaccuracy of the person, who created this three-leg horse problem
\n" ); document.write( "and disseminates it in the Internet.\r
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\n" ); document.write( "\n" ); document.write( "It is inappropriate level to communicate with the tutors, posting them crippled tasks.\r
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