document.write( "Question 811808: A steel bar 6.50 inches in diameter is being turned in a lathe. The surface speed of the bar is 55.0 feet per minute. How many revolutions will the bar make in 10.0 seconds? \n" ); document.write( "
Algebra.Com's Answer #488918 by TimothyLamb(4379)\"\" \"About 
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C = 2 pi R
\n" ); document.write( "C = 2 * 3.1415 * 3.25 in * (1/12 ft/in) = 1.7016 ft
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\n" ); document.write( "revs per minute (rpm):
\n" ); document.write( "55 ft/min * (1/1.7016) rev/ft = 32.321 rpm
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\n" ); document.write( "revs per second (rps):
\n" ); document.write( "32.321 rev/min * (1/60) min/sec = 0.539 rps
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\n" ); document.write( "revs per 10 seconds:
\n" ); document.write( "0.539 rev/sec * 10 sec = 5.39 revs
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