Question

A system dissipates 12 J of heat into the surroundings; meanwhile, 28 J of work is done on the system. What is the change of the internal energy ΔEth of the system? A system dissipates 12 of heat into the surroundings; meanwhile, 28 of work is done on the system. What is the change of the internal energy of the system? a. -40 J b. -16 J c. 16 J d. 40 J

Answer 1

Answer:

option C

Explanation:

given,

energy dissipated by the system to the surrounding = 12 J

Work done on the system = 28 J

change in internal energy of the system

Δ U = Q - W

system losses energy = - 12 J

work done = -28 J

Δ U = Q - W

Δ U = -12 -(-28)

Δ U = 16 J

hence, the correct answer is option C