Question

Ist Law of Thermodynamics

Question 2 of 10
What is the change in internal energy if 20 J of heat is released from a system
and the system does 50 J of work on the surroundings?
Use AU = Q-W.
A. 30 J
B. 70 J
C. 30 J
D. -70J

Answer 1

Change in heat energy = -30 J

Step-by-step explanation:

Given:

AU = Q-W

Heat energy Q = 20 J

Work done W = 50 J

Find:

Change in heat energy

Computation:

Change in heat energy = 20 J - 50 J

Change in heat energy = -30 J