Q.

When work done by a system was 10 J, the increase in the internal energy of the system was 30 J. the heat ‘q’ supplied to the system was:

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a

40 J

b

+20 J

c

-40 J

d

-20 J

answer is C.

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Detailed Solution

W=10J;q=?;ΔU=+30J

 But ΔU=q+W (first law of thermodynamics) 

30=q-10 ; q=30+10=40 J

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When work done by a system was 10 J, the increase in the internal energy of the system was 30 J. the heat ‘q’ supplied to the system was: