Question

A system absorbed 650 joule heat and did the work. Its internal energy change is 440 joules, then find out how much work has been done.

Answer 1

Answer:

W =  210 J

Explanation:

We have been given

System absorbed  heat  Q  =  650  

Internal energy Δ U = 440 J

Now

We know that

The change in internal energy of a system is equal to the heat added to   the system minus the work done by  the system.

We know that

Δ U = Q - W

440 = 650 - W

W = 650 - 440

W = 210 J

Work has been done  W =  210 J

Answer 2

Work done is - 210 joule

Explanation:

Given,

Absorbed heat , Q= 650 joule

Internal enegy change, $\Delta E$ = 440 joules

work done = ?

We know that,

$\Delta E = Q + W$

Or,

$W = \Delta E - Q$

W = 440 - 650

W = - 210 Joule ( because the work done by the system)

Work done is - 210 joule