In the United States a heat wave is a period of three or

Chapter 8, Problem 14

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In the United States a heat wave is a period of three or more consecutive days at or above 90 F. A heat wave is often accompanied by high humidity, making the air feel even hotter. The following formula combines an air temperature of 90 F with relative humidity, H, to give the apparent temperature, A, the perceived level of heat: A 86.61 0.132H 0.0059H2 This formula uses relative humidity as a percentage (e.g., 70% relative humidity appears in the formula as H 70). Remember, this formula applies only for an air temperature of 90 F. a. If the relative humidity is 0%, what is the apparent temperature for an air temperature of 90 F? Does the apparent temperature feel lower or higher than the air temperature of 90 F? b. On a 90 F day, if the relative humidity is 60%, what is the apparent temperature? How much hotter do you feel? c. An apparent temperature of 105 F or above is considered dangerous, especially for children and elders. At what relative humidity on a 90 F day is an apparent temperature of 105 F reached? 1