Physics

Problem

In a certain process a gas receives

120\,\text{J}

of heat and performs

50\,\text{J}

of work on the surroundings. Calculate the change in internal energy

\Delta U

of the gas. a)

+170\,\text{J}

-70\,\text{J}

+70\,\text{J}

+120\,\text{J}