How much work can be extracted from 5.00 × 10^4 J of heat when 2.00 × 10^4 J of heat is exhausted?
- 7.00 × 10^4 J

- 3.00 × 10^4 J

3.00 × 10^4 J

7.00 × 10^4 J

Question

How much work can be extracted from 5.00 × 10^4 J of heat when 2.00 × 10^4 J of heat is exhausted?
    -   7.00 × 10^4 J

     -  3.00 × 10^4 J

       3.00 × 10^4 J

       7.00 × 10^4 J

anonymous · Answer

@roadjester

anonymous · Answer

I know it has to do with the 3 just not sure if it's positive or negative

roadjester · Answer

$$\huge \Delta E_{int}= Q+W$$

anonymous · Answer

so I would add?

anonymous · Answer

I know E equals the heat input = exhaust heat + work done

roadjester · Answer

This problem actually confuses me...The wording...
You're looking for the work but you don't know the internal energy

roadjester · Answer

@ybarrap

roadjester · Answer

@JoannaBlackwelder

anonymous · Answer

guessing its 3.00 x 10^4 J

roadjester · Answer

@wolfe8

anonymous · Answer

well I'm sorry to cut this short but I have to go to sleep its almost midnight where I live bye!

wolfe8 · Answer

From what I Googled, yes you add as you did. I don't understand the wordings myself though.

raffle_snaffle · Answer

if you add it wouldn't b 3.00x10^4

wolfe8 · Answer

Well one of then is negative

joannablackwelder · Answer

I concur with the 3x10^4 J. Usable=total-waste

wolfe8 · Answer

That made complete sense of the question :O Thanks!