28. An airplane makes a gradual (90° turn while flying at a constant speed of 200 m/s. The process takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the plane is: A. zero a T- 2Tir B. 40 m/s C. 20 m/s D. 14m/s E. 10m/s 20 = 2 Tr 200 ans: D 4o00 = 2ir r= 637

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Chapter1: Units, Trigonometry. And Vectors
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28. An airplane makes a gradual (90° turn while flying at a constant speed of 200 m/s. The process
takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the
plane is:
А.
zero
2 Tir
B. 40 m/s
C. 20 m/s
D. 14 m/s
E. 10m/s?
2
20
2 ir
200
ans: D
4o00 = 2ir
r= 637
29. An airplane is flying north at 500 km/h. It makes a gradual 180° turn at constant speed,
changing its direction of travel from north through east to south. The process takes 40 s. The
average acceleration of the plane for this turn (in km/h-s) is:
A. 12.5 km/h·s, north
B. 12.5 km/h·s, east
C. 12.5 km/h·s, south
D. 25 km/h s, north
E. 25 km/h s, south
ans: E
Transcribed Image Text:28. An airplane makes a gradual (90° turn while flying at a constant speed of 200 m/s. The process takes 20.0 seconds to complete. For this turn the magnitude of the average acceleration of the plane is: А. zero 2 Tir B. 40 m/s C. 20 m/s D. 14 m/s E. 10m/s? 2 20 2 ir 200 ans: D 4o00 = 2ir r= 637 29. An airplane is flying north at 500 km/h. It makes a gradual 180° turn at constant speed, changing its direction of travel from north through east to south. The process takes 40 s. The average acceleration of the plane for this turn (in km/h-s) is: A. 12.5 km/h·s, north B. 12.5 km/h·s, east C. 12.5 km/h·s, south D. 25 km/h s, north E. 25 km/h s, south ans: E
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