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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 .... $joules$
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(d) $\Delta Q = \Delta W + \Delta U \Rightarrow 35 = - 15 + \Delta U \Rightarrow \Delta U = 50J$
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