WCP%20%2010 - Use this fact together with the frostbite...

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ATMS 120A/ESES 120A Fall Semester 2009 Name: _____________________________ Weekly Challenge Problem #10: Wind Chill Due: Tues. Dec 8, 2009 (Same as Problem 14.2 in text) You have been ice fishing in a warm heated shelter in the exact center of a lake with a 1- mile radius. While you were fishing, the leading edge of a polar airmass arrived, dropping the temperature to -10 ° F (-22 ° C). To make matters worse, the wind is now blowing from the north at 20 mph. Unfortunately, your car is parked on the north shore of the lake. Fortunately, the lake is surrounded by trees that reduce the wind speed in the trees by 50% from the speed over the frozen lake. You can walk or run at any speed up to 5.4 mph (11 min per mile). If you are to avoid frostbite, what is the safest route to your car? Why? Hints: When walking or running against the wind, your speed must be added to the wind speed.
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Unformatted text preview: Use this fact, together with the frostbite times that accompany the wind chill chart in Table 14.2 (p. 272 of your textbook). Assume that the time-to-frostbite for each wind-chill temperature is exactly the value for the color, i.e., do not worry about interpolating near the color boundaries. Consider three possible courses of action: (1) the short route -- running straight north, into the wind, to get to your car (2) the long route -- running straight south with the wind, then running halfway around the lake through the trees (3) the medium route -- running east or west to the trees, then running one-quarter of the lake’s circumference through the trees to get to your car. Don’t forget to explain your answer....
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