Question

The air in an inflated balloon (defined as the system) is warmed over a toaster and...

The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 115 J of heat. As it expands, it does 79 J of work.

What is the change in internal energy for the system, in Joules? Express your answer using two significant figures.

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Answer #1

According to the data, let's try to analize this.

the sistem absorbs heat, so is positive. q = 115 J

Now, work done by system means that the work is negative, so w = -79 J

the change in energy () is then:

= q + w

= 115 -79

= 36 J

Hope this helps.

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