Question

A system is provided with $50$Joules of heat and the work done on the system is $10$joules. What is the change in the internal energy of the system in Joules?

Answer 1

Step 1: Given

Heat provided to the system, q = $+50J$

Work done on the system, W = $+10J$

Step 2: Formula used and calculation

change in internal energy = heat provided + work done

$$\begin{gathered} \Rightarrow ∆U=q+W \\ \Rightarrow ∆U=50J+10J \\ \Rightarrow ∆U=60J \end{gathered}$$

Hence, change in internal energy is $60J$.