Question

Suppose 150 Joules of work is done on a system and that 300 Joules of heat are delivered to the system. Which of these does the first law of thermodynamics predict? Show all work.

Answer 1

150 J of work is done on the system means W = -150 J

Note that whenever work is done on the system take W negative

and 300 J delivered to the system means Q = +300 J

Note that whenever heat is delivered to system take Q positive

The first law of thermodynamics states

so

since is positive it means internal energy increased.

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