In a railroad classification yard, a 66-Mg freight car moving at 1.1 m /s at A encounters a retarder section of track at B which exerts a retarding force of 27 kN on the car in direction opposite to motion. Over what distance x should the retarder be activated in order to limit the speed of the car to 2.7 m /s at C? 184 m 2.6 m А В (Vertical scale exaggerated) C

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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In a railroad classification yard, a 66-Mg freight car moving at 1.1 m /s at A encounters a retarder section of track at B which exerts a retarding force of 27 kN on the car in
direction opposite to motion. Over what distance x should the retarder be activated in order to limit the speed of the car to 2.7 m /s at C?
184 m
2.6 m
B
(Vertical scale exaggerated)
C
v Part 1
Calculate the kinetic energies at A and C;
Answers:
TA =
| kg m2/s?
Tc =
|kg m²/s²
Transcribed Image Text:In a railroad classification yard, a 66-Mg freight car moving at 1.1 m /s at A encounters a retarder section of track at B which exerts a retarding force of 27 kN on the car in direction opposite to motion. Over what distance x should the retarder be activated in order to limit the speed of the car to 2.7 m /s at C? 184 m 2.6 m B (Vertical scale exaggerated) C v Part 1 Calculate the kinetic energies at A and C; Answers: TA = | kg m2/s? Tc = |kg m²/s²
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