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QUESTION
The power P obtained from a windmill is directly
The power P obtained from a windmill is directly proportional to the cube of the wind speed s.
a) Write an equation that expresses this variation.
b) Find the constant of proportionality for a windmill that produces 96 watts of power when
the wind is blowing at 20 mi/hr.
c) How much power will this windmill produce if the wind speed increases to 30 mi/hr?

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*** ****** *
** *
* ******* ***** k ** * ******** ** *
* {P/sā3} ** speed *
= ** ****** ***** * *
96W * = ***
*
20ā3} = 96/8000 = ***** * * **** **
* = *** *
* ***** * =
k*sā3 = ***********
* **** * * 324 *