Problem: The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 125 J of heat. As it expands, it does 78 kJ of work. What is the change in internal energy for the system?

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E=q+w

where w is work; and q is the heat release or absorb

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Problem Details
The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 125 J of heat. As it expands, it does 78 kJ of work. What is the change in internal energy for the system?

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