You push a wooden crate across rough ground with a force F over a distance d. A constant frictional force of magnitude f acts opposite in direction to the displacement. The only other forces on the lawn mower are gravity and the normal force. What is the potential energy stored in the system due to these forces

Nitrogen (n2) undergoes an internally reversible process from 6 bar, 247°c during which pν1.2 = constant. the initial volume is 0.1 m3 and the work for the process is 121.14 kj. assuming ideal gas behavior, and neglecting kinetic and potential energy effects, determine heat transfer, in kj, and the entropy change, in kj/s. show the process on a t-s diagram.