A heat engine using air starts with p1 = 3 atm and V1 of 5 L. Its pressure increases at constant volume to p2. It then expands adiabatically to V3 = 12 L. Finally it returns at constant pressure to its original state. Can someome please explain how to calculate Q12 and Q31 ? Please show all work so I can understand the process! Thank you!

Solve correctly please.

A closed system loses energy by heat transfer at the rate of 10kJ/s. Write the energy balance for this problem if the system operates at steady state

Q- mechanics, A fan consumes 50 W of electric power and has an air discharge of 0.25 kg/s, find the maximum air outlet velocity in this case.

No Handwriting please

3. A gas expands from the states V₁ = 1 m³ and P₁ = 40 Pa to V₂ = 3 m³ and P₁ = 15 Pa along path B in the PV diagram below. Then this gas is compressed back to V₁ either through paths A or C. How much work, total internal energy, and heat is done by the gas along paths (A) OBCO and (b) OBCO

Discuss all the laws of thermodynamics (Zeroth, first, second and third) and give their physical significance.