Using data for the effect of temperature and wind on an exposed face, the National

Weather Service uses the following formula,
Wind Chill Index = 35.74 + 0.6215𝑇 − 35.75𝑉!.!" + 0.4275𝑇𝑉!.!"
𝑇 is the temperature in degrees Fahrenheit and 𝑉 is the velocity of the wind in miles per hour. Frostbite
occurs in about fifteen minutes when the wind chill index is about −20. Find the wind speed that produces
a wind chill index of −20 when the temperature is 5℉.

1 answer

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