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On a summer day when the temperature is 80 degrees F, a trash fire emits 30,000 Btu to the atmosphere.By how much has the entropy of the atmosphere increased?
There is also a heat loss per unit mass of 5 kJ/kg. Kinetic and potential energy effects are negligible. What is the mass flow rate through the compressor?
What is the total flow rate in each pipe? What is the average velocity in each pipe? What is the mass velocity in each pipe?
A 1500kg car traveling at 16m/s suddenly runs out of gas while approaching the valley. What will be the car's speed as it coasts into the gas station on the other side of the valley?
What is the ratio of the final kinetic energy to the initial kinetic energy of the system (the two atoms)? In other words, what is KEfinal / KEinitial in this collision?
Taking the surface tension of soap solution to be 0.0027 lbf/ft. Determine the work input required to inflate the bubble to a diameter of 3.2 inj.
2 kg of stainless steel (aka "Iron, 304") is forged at 1150 C, and then cooled by immersing the steel in 5 kg of water at atmospheric pressure and 20 C.What is the change in total entropy.
Develop a double pipe heat exchanger, specifying velocities, mass flowrates, length and inlet and outlet temperatures. Also calculate the pressure drop for each fluid.
A reactor that has a thermal efficiency of 32% is rated at 900 MWe. If the reactor operated at 80% full power for 400 days, what is the decay heat (in MW) 120 s after shutdown?
Natural boron has a density of 0.128×1024 at/cm3 and a cross section sigma a = 760 b and sigma s = 4 b at an energy of E = 0.025 eV.
Assume 200 MeV is released per fission, the 235U fission cross section is 470 b, and the atomic weight of the uranium fuel is 238 g/mol. What is the value of the core average neutron flux in n/cm2-s?
Assume 200 MeV is released per fission, the 235U fission cross section is 470 b, and the atomic weight of the uranium fuel is 238 g/mol. What is the core average fission rate of the reactor in fission
The 235U fission cross section is 470 b, and the atomic weight of the uranium fuel is 238 g/mol. What is the number density (atoms/m3) of 235U in the reactor?
What must the RHR coolant flow rate be in gpm (gallons per minute) to ensure the removal of 3.0×109 J of decay heat in 10 minutes.
If the tire is filled with air and the final pressure after heating to 100F is actually 32 psi, calculate the change in entropy per unit mass.
One pound mass of air is contained in a piston-cylinder assembly that executes a Carnot power cycle. Determine the heat transfer to the air during the isothermal expansion (BTU).
Allowing a 5oC temperature difference between the external reservoirs and the air when appropriate, calculate the specific heat added to the cycle and its net specific work.
Estimate the surface area of the pond for this level of continuous power production. Assume that the solar energy is incident on the pond at a rate of 500 W per m2 of pond area at noontime.
Determine the impulse provided by the floor to the laptop and the average acceleration to which the laptop is subjected when in contact with the floor.
A spherical balloon initially at 150 mm in diameter and containing R-22 at 150 kPa is connected to a 30 L insulated rigid tank containing R-22 at 500 kPa.
At what wind tunnel speed should the wind tunnel be run in order to acheive dynamic similarity? Estimate the aerodynamic drag of the model parachute in the wind tunnel?
Determine the heat transfer to the air during the isothermal expansion (BTU). Determine the heat transfer from the air during the isothermal compression, Q41 (BTU).
The mean velocity of the steam through the duct is 40 m/s. Determine the flow work required to push the steam into the duct.
If the angle of slip direction is 330 and the normal to the slip plane is 720, will the crystal yield if the applied axial force is 9200 psi? What is the yield stress of the crystal?
50.0 mL of a 0.50 M solution of potassium cyanide is mixed with 10.0 mL of a 2.0 M solution of hydrochloric acid. How many grams of lethal hydrogen cyanide gas are produced?