By which of the following means can the internal energy of a substance be increased? 1. Cooling the substance 2. Performing work on the substance 3. Heating the substance
a. 2 and 3 only
b. 1 and 2 only
c. 2 only
d. 1, 2, and 3
ANS: A
You can increase the internal energy of an object by heating it or by performing work on it.
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