What wind speed would produce the same wind chill using the 1939 ormula as the wind chill produced using the 2001 formula when the outside temperture is `0^(@)F` and the wind speed is 40 miles per hour ?
What wind speed would produce the same wind chill using the 1939 ormula as the wind chill produced using the 2001 formula when the outside temperture is `0^(@)F` and the wind speed is 40 miles per hour ?
A
10 miles per hour
B
15 miles per hour
C
20 miles per hour
D
40 miles per hour
Text Solution
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The correct Answer is:
B
Since the conditions mentioned are the same as those in the previous question, start with the wind chill calculate using the 2001 formula for that question, `-30^(@)F.`
Draw a horizontal line from `- 30^(@)F` on the y-axis until it intersects a data point on the 1939 formula plot. Draw a vertical line from the point down to the x-axis : you'll find that in 1939, a wind speed of approximately 15 mph would yield a wind chill of `-30^(@)F.` Therefore, the correct answer is (B).
Draw a horizontal line from `- 30^(@)F` on the y-axis until it intersects a data point on the 1939 formula plot. Draw a vertical line from the point down to the x-axis : you'll find that in 1939, a wind speed of approximately 15 mph would yield a wind chill of `-30^(@)F.` Therefore, the correct answer is (B).
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