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songoku
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Homework Statement
Which statement about internal energy is correct?
A. When two system have the same internal energy, they must be at the same temperature
B. When the internal energy of a system is increased, its temperature always rises
C. The internal energy of a system depends only on its temperature
D. The internal energy of a system can be increased without transfer of energy by heating
Homework Equations
U = PE + KE
ΔU = Q - W
The Attempt at a Solution
I think the answer is D my not sure about the reasoning. If let say I rub a metal against rough floor, the friction will increase the temperature of the metal hence the internal energy increase. Is this example of increasing internal energy without heating?
Thanks