1. (a) Explain the physical process represented by the equation below. Why is increasing? Hence define Equivalent Potential Temperature. L T 0 Ws 0e dw s = Cp de ! 0 (b) Thus, explain why the adiabatic liquid water content (LWC) is greater than the measured LWC inside a cumulus cloud.

ts Suppose you have a gas that obeys the following modified van der Waals equation: P(V – nb) = nRT %3D a) In 1-2 sentences, provide a physical interpretation for this equation. HINT: Compare this with the octual van der Waais equation. What does the missing term represent? b) For a gas obeying this modified van der Waals equation, derive an expression for the work done by a reversible and isothermal change in volume. c) For this modified van der Waals equation (with n and b as constants), find the following two partial derivatives: i) ii) T

QUESTIOΝ 1: A piston-cylinder arrangement contains 2 kg of steam originally at 200°C and x-0.9. The volume triples while thc temperature is held coustant. Pieten Calculate: (a) the linal pressure, in MPa, 7=200 C (c) the change in intermal energy, in kl.

Please take Appropriate Values at the given conditions,Don't Copy.

A cylinder fitted with a piston has a volume of 0.1 m'and contains a 0.8 kg of steam at 0,.4 MPa. Heat is trausferred to the steam umntil the temperature is 250°C, while the pressure remmains constant. (1) vi (specific volume) in m'kg = (2) v: (specific volume) in m'kg = (3) xi (quality) = . (4) us (specific internal energy) in k/kg (5) uz (specific internal energy) in kJ/kg =. (6) Xx: (quality)= (7) Phase description at imitial state is. (8) Phase description at fitsal state is (9) W (work) in kJ= (10) Q (heat) in kJ =

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As shown in the figure, a tank fitted with an electrical resistor of negligible mass holds 2 kg of nitrogen (N₂), initially at 27°C, 0.1 MPa. Over a period of 10 minutes, electric power Eelectric of 0.35 kW is provided to the resistor. During this same period, a heat transfer of magnitude 10.5 kJ occurs from the nitrogen to its surroundings. Assume ideal gas behavior, but do not assume constant specific heats. Determine the final temperature, in °C, and the final pressure, in MPa. Nitrogen, N₂ m = 2 kg T₁ = 27°C P₁ = 0.1 MPa eeeeeee Qout, 12 = 10.5 kJ É electric At 10 minutes

Given: Water, T = 103.6°F, u = 961.5 Btu/lbm %3D Find: quality, x (%) Your Answer:

The expression for the Joule Thompson coefficient for a gas described by the van der Waals equation of state, at low pressures, can be expressed as: 1 2a -—- (2017-b) Cp\R* T i) What will μT be for an ideal gas? Why must this be the case? ii) How does this expression simplify at high temperature? a) Will μT be positive or negative? b) How does temperature change under conditions of low pressure and high temperature, when this gas expands? iii) How does this expression simplify at low temperature? a) Will μT be positive or negative? b) How does temperature change under conditions of low pressure and low temperature, when this gas expands? iv) Calculate the Joule Thompson coefficient of ethane at 300K and 600K. HJT = You can find the heat capacity needed at the NIST Webbook. Search for ethane and then go to the "Gas phase thermochemistry data." Use the values for 1 bar. Pay close attention to units. Your answer should have units of K/atm. The vdw parameters for ethane are: a…

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