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Grade: 11

                        

The New Hampshire State Police use aircraft to enforce highway speed limits. Suppose that one of the airplanes has a speed of 135 mi/h in still air. It is flying straight north so that it is at all times directly above a north-south highway. A ground observer tells the pilot by radio that a 70 mi/h wind is blowing but neglects to give the wind direction. The pilot observes that in spite of the wind the plane can travel 135 mi along the highway in 1 h. In other words, the ground speed is the same as if there were no wind. (a) What is the direction of the wind? (b) What is the heading of the plane-that is, the angle between its axis and the highway?

5 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
							234-1371_1.PNG
Round off to three significant figures,
a = 105°
234-1682_1.PNG
5 years ago
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