## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

We can find the energy $Q$ that is transferred to or from the system as heat as: $\Delta U = Q + W$ $Q = \Delta U - W$ $Q = (-200~J) - 500~J$ $Q = -700~J$ The negative sign means that 700 J of energy is transferred from the system as heat.