A signal e σt cos ωt can be expressed as a sum of exponentials e st and e s ∗t with complex frequencies s = σ + jω and s ∗ = σ − jω. For each signal sketched below: (a) Identify its complex frequencies. (b) Express the signal as a sum of complex exponentials

Apiston-cylinder device contains 0.1 m3 of liquid water and 0.9 m3 of water vapor in equilibrium at 800 kpa. heat is transferred at constant pressure until the temperature of water reaches 350 °c. determine (a) the quality of water at the initial state (b) the work associated with this process, (c) the heat associated with this process.