Question

A system has 30 Joules of thermal energy added while the system expands performing 45 Joules of work. What happened to the internal enerpy of the sysienr? Increased Decreased Stayed the same Not enough information.

Answer 1

Decreases

Step-by-step explanation:

ΔU = Q - W

ΔU = Change in internal energy

Q = Heat added to the system

W = Work done by the system

Q = 30 Joules

W = 45 Joules

ΔU = 30 Joules - 45 Joules = - 15J

The change in internal energy (ΔU) is negative and equal to -15 Joules. This means the internal energy of the system decreased.