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Question
If the amount of heat given to a system be 105 joules and the amount of work done by the system be 55 joules, then the change in the internal energy of the system (in Joule) is
If the amount of heat given to a system be 105 joules and the amount of work done by the system be 55 joules, then the change in the internal energy of the system (in Joule) is
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Solution
The correct option is A 50
From first law of thermodynamic, △U=q+w
where q = Heat entering the system
w = Work done on the system
△U = Change in Internal energy
Given, q = 105 J, w = -55 J
⇒△U=105−55=50 J
From first law of thermodynamic, △U=q+w
where q = Heat entering the system
w = Work done on the system
△U = Change in Internal energy
Given, q = 105 J, w = -55 J
⇒△U=105−55=50 J
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