Three hundred joules of heat are added to a system. the system uses 140 joules to do work.
by how much did the internal energy of the system change?
a 140 j
b 160 j
c 240 j
d 440 j

b 160 J

Explanation:

We can solve the problem by using the first law of thermodynamics:

where:

is the variation of internal energy of the system

Q is the heat addd to the system

W is the work done by the system

In this problem, we have:

Substituting into the equation, we find:

not moving. pos accel,