A 2.0 kg metal block (c = 0.137 cal/g • °C) is heated from 15 °C to 90 °C. By how much does its internal energy change?
The change in internal energy of
Answer to Problem 21SP
Solution:
Explanation of Solution
Given data:
Mass of the metal block is
Temperature changes from
Specific heat of the metal block is
Formula used:
First law of thermodynamics:
Here,
Write the expression for heat gain or loss if a body or substance undergoes temperature changes;
Here,
Explanation:
Calculate the change in temperature:
Recall the expression for heat required to raise the temperature:
Substitute
There isnot any movement in the metal block. Therefore, the work done by or on the system is zero.
Recall the expression of first law of thermodynamics:
Substitute
Conclusion:
The change in internal energy of the given metal block is
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Chapter 20 Solutions
College Physics
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