9.2. Real Work

Try these first

1. 1.

   Define the concept of Real Work in energy methods.

   Hint

   Consider the definition of energy conservation.

2. 2.

   What is the significance of an adiabatic system?

   Hint

   Think about thermal conditions.

3. 3.

   What does the first law of thermodynamics state?

   • Energy can be created
   • Energy cannot be created nor destroyed
   • Energy always increases

   Hint

   Recall how energy behaves in closed systems.

4. 4.

   In an adiabatic process, which of the following applies?

   • True
   • False

   Hint

   Consider the thermal properties of the system.

5. 5.

   A structural beam 3 m long with a cross-section of 0.05 m² and E = 150 GPa is loaded with a force of 3000 N. Calculate the strain energy.

   Hint

   Calculate step-by-step for clarity.

6. 6.

   For a cylindrical shaft with length L, subjected to a torque T, derive the expression for energy stored due to torsion.

   Hint

   Consider the integration bounds and the physical meaning of each variable.