A new vehicle propulsion scheme calls for the use of liquid nitrogen as "fuel." The details of the power cycle are not the issue here (in brief, the liquid nitrogen is heated in contact with the atmosphere, pressurized, and expanded through the turbine that drives the vehicle). Calculate the max- imum work that could theoretically be extracted from the liquid nitrogen fuel. During each refueling stop, the driver purchases a Dewar vessel (a bottle) containing 0.05 m of liquid nitrogen at atmospheric pressure. The driver leaves in exchange a used bottle, that is, a bottle contain- ang gaseous N2 at atmospheric pressure and temperature. The proper- ties of nitrogen as saturated liquid at 1 atm are v = 1.24 x 10- m'/kg, h = -121.5 kJ/kg, and s ties of nitrogen at atmospheric temperature and pressure (300 K, 1 atm) are v = 0.49 m'/kg, h = 2.85 kJ/kg K. The corresponding proper- %3D = 172.1 kJ/kg, and s 6.25 kJ/kg K. %3D

. You never need to plug in Toyota’s gasoline-battery hybrid car to recharge the batteries.Explain?

Can someone help me to solve the following question showing all work.

Which statement is fals? O In an isolated system of many particles in equilibrium a microstate with all particles having the same energy is more likely than a microstate with 1/ of the particles having the same energy and 1/2 of the particles having zero energy. When water freezes its entropy decreases. O The coefficient of performance for a heat pump is the ratio of the energy delivered at the higher temperature to the work put into the system. O The coefficient of performance for a refrigerator is the ratio of the energy removed at the lower temperature to the work put into the system. O The total entropy of a closed system is always increasing is one way of stating the second law of thermodynamics.

If one mole of air (rigid diatomic gas) is initially at 20 ◦C, is compressed and expanded 7-fold as part of the Diesel cycle, and 4 kJ of heat is generated as a result of the fuel injectionand combustion, calculate: (i) the temperature after each stage of the Diesel cycle; (ii) the heat absorbed/expelled during each stage of the cycle; and (iii) the efficiency of the Diesel cycle.

A simple carburetor is adjusted for a 15.2:1 air-fuel ratio at sea level and 600F. Determine the air-fuel ratios at 10,000 feet, 16,000 feet and 20,000 feet altitudes.