Chapter 6, Problem 6.74P

3) A cup of rather dilute hot tea initially at 140 degrees F is served to a customer at Howard Johnson's. Unfortunately, before they get around to drinking it, it has spontaneously cooled off to 200 0 100 degrees F. Calculate the change in this process. The temperature of the entropy of the universe for restaurant (the surroundings) is 70 degrees F. (DHD 2/6/22) Suppose that the heat has problem 3, in order to save the inside temperature is been turned off in the HoJo's in money in the cold winter months, and 32 degrees F. The hot tea cools from HOWARD 140 degrees F to 32 degrees F, and then freezes, making it JOHNSON'S impossible to drink. What is the change in entropy of the universe in this case? (DHD 2/6/22) LCE CREAM 28 FLAVORS Restaurant Return to problem 3. Suppose that our customer complains about the cold tea and is given a second cup of hot tea. Feeling especially hungry (for tea?) they mix the hot tea and the cold tea together so that they will have twice as much tea (albeit…

Air flows steadily through an engine at a constant temperature, 400K. Find the work per kilogram if the exit pressure is one-third the inlet pressure and the inlet pressure is 207 kPa. Assume that the kinetic and potential energy variation is negligible.

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An air compressor absorbs 1000 kg of air per hour at a pressure of 100 kPa and 500 kPait presses on the pressure. Specific volume of air at compressor Inlet 0.8 m3/ kg, at Exit0.2 m3/ kg dir. The internal energy of the air at the outlet is 100 kJ/kg more than at the inlet.60 000 kJ/h heat transfer occurs from the compressor to the air. Kinetic and potential energyfind the power needed to operate the compressor, neglecting its changes.

The power of a steam turbine in a thermal power plant is 60 MW. Water vapor enters the turbine at 3MPa pressure, 4000C temperature and 50 m / s speed, 10 kPa pressure, 0.9 dry degree and 200 m / s speed leaves the turbine. Considering the turbine as adiabatic; 1-Find the mass flow of steam 2-Find the turbine outlet cross-sectional area, its ratio (A2 / A1) to the inlet cross-sectional area.

Q6. A 500 W heater is used to melt 5 kg of solid ice at -30°C to gas at +130°C at a constant pressure of 100 kPa. (a) Show the process on the p-T-v, p-v and T-v diagrams (b) Find the change in the total volume of the water (c) Find the energy the heater must provide to the water (d) Find the time the process will take assuming uniform T in the water

If 10 kg/min of air are compressed isothermally from P1=96kPa and V1=7.65m^3/min toP3=620kPa, find the work change of entropy and the heat for: a) nonflow process and b) steadyflow process with v1=15m/s and v2=60m/s.

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