Question

Some amount of energy is transferred by heat into a system. The net work done on the system is 56 J, while the increase in its internal energy is 12 JWhat is the amount of net heat?

Answer 1

Given,

The net-work done on the system is

$\Delta w=56\text{ J}$

The increase in its internal energy is

$\Delta U=12\text{ J}$

By the first law of thermodynamics.

$Q=\Delta U-\Delta w$

Put the given values,

$\begin{gathered} Q=12J-56\text{ J} \\ Q=-44\text{ J} \end{gathered}$

Thus, the amount of net heat is -44 J.