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(a) Calculate the rate of heat transfer by radiation from a car radiator at $110^\circ\textrm{C}$ into a $50.0^\circ\textrm{C}$ environment, if the radiator has an emissivity of 0.750 and a $1.20\textrm{ m}^2$ surface area. (b) Is this a significant fraction of the heat transfer by an automobile engine? To answer this, assume a horsepower of 200 hp and the efficiency of automobile engines as 25%.
1. $-543\textrm{ W}$
2. Only about 0.12% of heat is transferred from the radiator by radiation. Most heat is transferred by conduction to cold air blown through the radiator by a fan.
Solution Video

# OpenStax College Physics for AP® Courses Solution, Chapter 14, Problem 58 (Problems & Exercises) (2:56)

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