The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long. The top surface is absorbing solar radiation at a rate of 200 W/m², and the temperature of the ambient air is 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat ex- change with the surroundings to be small relative to convec- tion, determine the equilibrium temperature of the top surface of the car. Answer: 35.1°C

The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long. The top surface is absorbing solar radiation at a rate of 200 W/m², and the temperature of the ambient air is 30°C. Assuming the roof of the car to be perfectly insulated and the radiation heat ex- change with the surroundings to be small relative to convec- tion, determine the equilibrium temperature of the top surface of the car. Answer: 35.1°C

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

The top surface of the passenger car of a train moving
at a velocity of 70 km/h is 2.8 m wide and 8 m long. The top
surface is absorbing solar radiation at a rate of 200 W/m?, and
the temperature of the ambient air is 30°C. Assuming the roof
of the car to be perfectly insulated and the radiation heat ex-
change with the surroundings to be small relative to convec-
tion, determine the equilibrium temperature of the top surface
of the car.
Answer: 35.1°C
200 W/m2
Air
30°C
70 km/h

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