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If the amount of heat given to a system be 35 joules and the amount of work done by the system be -15 joules, then the change in the internal energy of the system is

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-50 joules

20 joules

30 joules

50 joules

answer is D.

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Detailed Solution

$Δ Q = Δ W + Δ U \Rightarrow 35 = - 15 + Δ U \Rightarrow Δ U = 50 J$

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