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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 (heat transfer coefficient h = 40 W/m2.C). The top surface is absorbing solar radiation at a rate of 200 W/m2, and the temperature of the ambient air is 30C. Assuming the roof of the car to be perfectly insulated and the radiation heat exchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car.

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