document.write( "Question 1194334: An iron ball 9 in. diameter weighs 14 lb. Find the weight of an iron shell 2 in. thick whose external diameter is 20 in. \n" ); document.write( "
Algebra.Com's Answer #826520 by ikleyn(52818)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "(1)  Find the density of iron by dividing the weight of the sphere 9 inches of diameter by its volume.\r\n" );
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document.write( "     Check the value of the iron density, which you get, with the standard value from the tables.\r\n" );
document.write( "     If it is close, continue your calculations in steps 2 and 3.\r\n" );
document.write( "     If it is not close, stop your calculations, since the input is incorrect.\r\n" );
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document.write( "(2)  Find the volume of metal of the second hollow sphere as the difference of the outer and interior volumes.\r\n" );
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document.write( "(3)  Find the density of the hollow sphere multiplying the metal volume by the iron density.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Happy calculations (!)\r
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\n" ); document.write( "\n" ); document.write( "Regarding the post by @josgarithmetic, where he proposes to use for\r
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document.write( "    VOLUME of the shell, \"pi%2810%5E2-8%5E2%29=pi%28100-64%29=highlight_green%2836pi%29\"\r\n" );
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\n" ); document.write( "\n" ); document.write( "you better  IGNORE  it for your safety,  since his formula is  TOTALLY  WRONG  and  IRRELEVANT.\r
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\n" ); document.write( "\n" ); document.write( "Use the correct formula for the volume of this shell \r
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document.write( "    V = \"%284%2F3%29%2Api%2A%2810%5E3-8%5E3%29\" = \"650.667%2Api\" = 2044.128 cubic inches.\r\n" );
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\n" ); document.write( "\n" ); document.write( "I am sure you know it,  since this knowledge is a necessary pre-requisite for solving this problem.\r
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\n" ); document.write( "\n" ); document.write( "After seeing my post, @josgarithmetic erased his writing, and it is good: it means that my notice was not wasted.\r
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\n" ); document.write( "\n" ); document.write( "At least, feature readers will be spared of seeing that gibberish.\r
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