Asystem absorbs 194 kj of heat and the surroundings do 120 kj of work on the system. internal eneergy change

We can solve the problem by using the first law of thermodynamics, which states that:

where
is the change in internal energy of the system
Q is the heat absorbed by the system
W is the work done by the system

In our problem, the heat absorbed by the system is Q=+194 kJ, while the work done is W=-120 kJ, where the negative sign means the work is done by the surroundings on the system. Therefore, the variation of internal energy is

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.