Question

Air in a balloon does

28 J

of work while absorbing

84 J

of heat. What is its change in internal energy?
J

Answer 1

As we know that ;

= Q=∆U+W

here,

= Q= 84 J

= W= 28 J

Then,

= ∆U=Q-W

= ∆U=84J - 28J

= ∆U=56 J