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14 June, 20:34

Find the change in internal energy of a system which receives 70 J of heat from its environment and does 20 J of work.

Select one:

a. 90 J

b. 50 J

c. Zero

d. - 70 J

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Answers (1)
  1. 14 June, 21:58
    0
    option B

    Explanation:

    given,

    Q = energy input = 70 J

    U = increase in internal energy

    W is the work done = 20 J

    using first law of thermodynamics

    The change in internal energy of a system is equal to the heat added to the system minus the work done.

    U = Q - W

    U = 70 - 20

    U = 50 J

    The change in internal energy is equal to 50 J

    Hence, the correct answer is option B
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