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## Homework Statement

In moving out of a dormitory at the end of the semester, a student does 2.62 x 10^4 J of work. In the process, his internal energy decreases by 3.96 x 104 J. Determine each of the following quantities (including the algebraic sign):

**(a)**

*W*,

**(b)**

*U*, and

**(c)**

*Q*.

## Homework Equations

b) ∆U = Q-W

c) if the system does work its positive, if the system has work done on its negative

## The Attempt at a Solution

I got (a) right, it is 2.62 x 10^4 J

b)

-3.96E4 - (2.62E4) = -65800

c)

-3.96E4 but I'm not sure about if it is negative or positive

And does the algebraic sign just mean + or -?