Question

Answer

Given:
The thermal energy added to the system is Q = 90 J
The work done by the system on the surroundings is
W = 30 J
To find the change in internal energy.
Explanation:
According to the first law of thermodynamics, the
change in internal energy can be calculated by the
formula
AU = Q-W
On substituting the values, the change in internal en...
AU -90-30
= 60 J
Final Answer: The chage in internal energy is 60 J
(option D)
EdemT260579. Beginner
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Q

Answer 1

Step-by-step explanation:

Given:

Q = 90 J

W = 60 J

________

ΔU - ?

1 law of thermodynamics:

Q = ΔU + W

Change in internal energy:

ΔU = Q - W = 90 - 30 = 60 J