(7%) Problem 3: Consider the change in the internal energy of a system × What is
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Question
(7%) Problem 3: Consider the change in the internal energy of a system × What is the change in the internal energy in joules, of a system that does 4.55 x 105 J of work, while 2.85 x 106 J of heat is transferred into the system and 7.9 × 100 J of heat is transferred from the system to the environment? Grade Summary Deductions Potential 12% 88% Submissions Attempts remaining: 2 (4% per attempt) detailed view tan() | | ( cosO cotan0 asin) acos0 atan)acotan) sinh0 4% 4% 4% 0 coshO tanhO cotanh0 Degrees Radians END 0 Submit Hint Feedback I give up! Hints: 1 for a 0% deduction. Hints remaining: 0 Feedback: 2% deduction per feedback Use the first law of thermodynamics, but make sure you understand what signs all the quantities will have. There are two heat transfersExplanation / Answer
Change = Initial Energy - Final Energy
here Lost enegies are (UL) = WOrk + Heat transferred to environment
Gain Energies (UG) = Heat transferred to system
Total UL = (4.55 x 10^5) + (7.9 x 10^6) = 8355000 J
Total UG = 2.85 x 10^6 J
Difference (UD) = UG - UL
UD = 2.85 x 10^6 - 8355000
UD = -5505000 J (ANswer)
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