Example Problem Solutions from:

Physics for Scientists & Engineers

by Douglas C. Giancoli
Volume 1, 4th Edition, Pearson Prentice Hall, Upper Saddle River, NJ, 2008

Chapter 19: Heat and the First Law of Thermodynamics

"CHAPTER-OPENING QUESTIONS - Guess now!
A 5-kg cube of warm iron (60 degree C) is put in thermal contact with a 10-kg cube of cold iron (15 degree C). Which statement is valid:
(a) Heat flows spontaneously from the warm cube to the cold cube until both cubes have the same heat content.
(b) Heat flows spontaneously from the warm cube to the cold cube until both cubes have the same temperatures
(c) Heat can flow spontaneously from the warm cube to the cold cube, but can also flow spontaneously from the cold cube to the warm cube
(d) Heat can never flow from a cold object or are to a hot object or area
(d) Heat flows from the large cube to the smaller one because the larger one has more internal energy."

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