document.write( "Question 115106: An airplane propeller whose blades are 5.50 feet long is rotating at 2400 rpm. Find the linear speed of a point on the end of the blade. \n" ); document.write( "

Algebra.Com's Answer #83743 by solver91311(24713) $\"\"$ $\"About$

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Unless something is horribly wrong, the end of a propeller blade travels in a circle. If the blade is 5.5 feet long, presumably measured from the center of the propeller dome, then the circle described by the end of the blade has a radius of 5.5 feet. Therefore, the circumference of the circle is given by $\"C=2%2Api%2A5.5=11%2Api\"$ feet.\r
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\n" ); document.write( "\n" ); document.write( "Since the propeller is rotating at 2400 rpm, the tip of the blade is travelling $\"11%2Api%2A2400\"$ feet per minute or $\"26400%2Api\"$ feet per minute, which is to say $\"440%2Api\"$ feet per second or $\"300%2Api\"$ miles per hour.\r
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\n" ); document.write( "\n" ); document.write( "Since the problem did not say to compute to some nearest decimal place accuracy, I left the answers in their exact form.\r
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