Question

A gas in a closed container is heated with 10 J of energy, causing the lid of the container to rise 2 m with 3 N of force. What is the total change in energy of the system?

Answer 1

Given: Q = 10 J , Force= 3N,

Displacement = 2 m

Work done (W) = Force x Displacement

= 3 x 2 = 6J

By first law of thermodynamics,

ΔU = | Q | - | W |

= 10-6 4J