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)
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
-3.96E4 - (2.62E4) = -65800
-3.96E4 but I'm not sure about if it is negative or positive
And does the algebraic sign just mean + or -?