Calculate the internal energy change in each of the following cases `:-` (i) A system absorbs 15 kJ of head and does 5 kJ of work. (ii) 5 kJ of works is done of the system and 15 kJ of heat is given out by the system.

Calculate the internal energy change in each of the following cases `:

1.	Calculate the internal energy change in each of the following cases `:-` (i) A system absorbs 15 kJ of head and does 5 kJ of work. (ii) 5 kJ of works is done of the system and 15 kJ of heat is given out by the system.
Answer» (i) Here, `q= + 15 kJ , w= - 5 kJ` `:.` According to first law of thermodynamics., `Delta U = q+w= 15 + (-5) = 10 kJ` Thus, internal energy of the system increasesby `10 kJ` (ii) Here,` x= + 5 kJ, q = - 15 kJ` `:. `According to first law of thermodynamics, `Delta U = q+ w= -15 + (+5) = - 10kJ`

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Calculate the internal energy change in each of the following cases `:-` (i) A system absorbs 15 kJ of head and does 5 kJ of work. (ii) 5 kJ of works is done of the system and 15 kJ of heat is given out by the system.

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