document.write( "Question 141130: suppose the record shown played for 16.5 minutes on one side and the average of the radii of the grooves on the record was 3 and 3/4 inches. there are 33 1/3 revolutions per minute. Write an expression involving units that represents how manby inches the needle passed through the grooves while the record was being played. then evaluate the expression. \n" ); document.write( "

Algebra.Com's Answer #102908 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Suppose the record shown played for 16.5 minutes on one side and the average of the radii of the grooves on the record was 3 and 3/4 inches. there are 33 1/3 revolutions per minute. Write an expression involving units that represents how many inches the needle passed through the grooves while the record was being played. then evaluate the expression.
\n" ); document.write( ":
\n" ); document.write( "This involves finding the average circumference, from the average radius (3.75\")
\n" ); document.write( "Multiply this by the no. of minutes played at 33 1/3 rpm
\n" ); document.write( ":
\n" ); document.write( "D = 2*pi*r * time * record speed (rpm)
\n" ); document.write( ":
\n" ); document.write( "D = 2*pi*3.75 * 16.5 * 33.33
\n" ); document.write( ":
\n" ); document.write( "D = 25.562 * 16.5 * 33.33
\n" ); document.write( ":
\n" ); document.write( "D = 12,958 inches \n" ); document.write( "

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