
Concept explainers
The direction of heat flow and temperature between two pieces of iron.

Answer to Problem 1OQ
Solution:
B. Heat flows spontaneously from the warm cube to the cold cube until both cubes have same temperature.
Explanation of Solution
Explanation:Given:
Formula Used: The formula used is the relation between temperature and specific heat from thermodynamics:
Where,
From the formula above, the equilibrium temperature formula can be derived.
If two materials
This equilibrium temperature:
Equating the heat transferred is
This becomes:
Where,
Calculation: Inserting the given values in the equilibrium temperature formula
The final equilibrium temperature is 45 C. Since
The answer is B.
Conclusion:
Heat flows spontaneously from the warm cube to the cold cube until both cubes have same temperature.
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Chapter 14 Solutions
Physics: Principles with Applications
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