document.write( "Question 1186506: The force of the wind on a sail varies jointly as the area of the sail and the square of the wind velocity. On a sail of area 50 sq. yd, the force of a 15 mph wind is 45 pounds. Find the force on the sail if the wind increases by 30 mph. \n" ); document.write( "

Algebra.Com's Answer #817429 by ikleyn(52887) $\"\"$ $\"About$

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document.write( "The speed of the wind increased from 15 mph to 15 + 30 = 45 mph.\r\n" );
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document.write( "The area of the sail did not change.\r\n" );
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document.write( "With the speed of the wind increased thrice, the new force is 3^2 = 9 times as large as 45 pounds, i.e. \r\n" );
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document.write( "     9 * 15 = 135  pounds.    ANSWER\r\n" );
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