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U1, q, w, U2 are given. U1 is internal e...

`U_1`, q, w, `U_2` are given. `U_1` is internal energy, q is absorbed heat, w is work done and `U_2` is final energy.
a) Derive an equation for `DeltaU.`
b) Give the equation for w.
c) Calculate the change in internal energy of a system which absorbs 200 J of heat and 315 J of work is done by the system.

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