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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96W * = ***
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