Question

What is the change in internal energy if 60 J of heat is released from a system

and 30 J of work is done on the system? Use AU = Q-W.
OA. 30 J
OB. -30 J
OC. 90 J
OD. -90 J

Answer 1

30J

Step-by-step explanation:

Δq = Δu + Δw

⇒Δu = Δq - Δw

here, Δq = 60J & Δw = 30J

∴ Δu = 60 - 30 = 30 J