Question

A system gives out 30 Joule of heat and does 75 Joule of work.What is the internal energy change?​

Answer 1

Question :-

A system gives out 30 Joule of heat and does 75 Joule of work.What is the internal energy change?

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Given :-

A system gives out 30J of heat and does 75 J of work

Find :-

internal energy change

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Solution

∆U = q + w where ∆U , q , w is the internal energy , heat change and work done respectively .

∆U = -30-75 = -105 J

hence , -105J is the answer

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$\boxed{ \bf \: answer = > 150 \bold{j}}$

Extra information ★

• Joule is the SI unit of work or energy
• internal energy (simple definition ) the energy arising from the relative positions and interactions of its parts .

Answer 2

Answer:

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