First slide

First law of thermodynamics

Question

Pickout the correct statement for the following pairs of work and heat

Easy

A

W = - 500J and Q = 0, U decreases
B

W = - 100J, Q = - 100, U increases
C

W = 0, Q = - 200J, U is constant
D

W = 300J, Q = 500 J, U increases

Solution

By first Law of Thermodynamics,
$Q = ΔU + W \Rightarrow ΔU = Q - W$
$\begin{array}{l} If Q = 0, W = - 500 J, ΔU = + 500 J (increases) \\ If W = - 100 J, Q = - 100 J, ΔU = 0 (constant) \\ If W = 0, Q = - 200 J, ΔU = - 200 J (decreases) \\ If W = 300 J, Q = 500 J, ΔU = + 200 J (increases) \end{array}$

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