Question

If on giving 40 joule of heat to a system, work done on the system is 10 joule, what will be the change in internal energy of the system?​

Answer 1

Answer:

50 J

Explanation:

∆U=q+w

here q,=40J

and w=10J

thus, change in internal energy =∆U=10+40=50J

Answer 2

The change in internal energy of the system is equal to 50 J.

• Work done by the system is taken to be negative while work done on the system is taken to be positive.
• Heat supplied to the system is taken to be positive while heat liberated by the system is taken to be negative.
• Now, by first law of thermodynamics, ΔU = q+w
• Hence, substituting the values, the change in internal energy is equal to 50 J.