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The activation energy for creep is 140 kJ/mol. Calculate the steady-state creep rate at 523 K at a stress level of 48 MPa.
Assume that the efficiency of the jeep's power train is 20%. What power input is required to achieve the required power output?
At steady state a commercial freezer maintains its interior temperature of -30F by rejecting heat to the surroundings at a rate of 2 kW.
According to the electric bill, the heat pump utilizes 3,000 kW*h per month (30 days). Calculate: (a) The amount of heat the pump captures from the ambient air over that period of time in kJ.
the temperature inside is measured to be 350°F. Determine the net change in entropy for this process. Assume the surroundings to be at 500°F. Show all work.
The angular velocity of linkABis w(AB)= 4.6 rad/s. Determine the magnitude of the velocity of the block at Cat the instant theta= 45and phi= 30.
Determine: a) the mass flow rate of the steam,(6.13 lbm/s) b) the rate of entropy generation for this process. Assume an ambient temperature of 77°F (0.0395 Btu/s-R).
The waste heat from the gas turbine is used by an absorption chiller with a COP of 0.8. What would you estimate the cooling capacity of the absorption chiller to be?
The boiler produces 40,000 lbms/hour of saturated steam and has an efficiency of 82%. It is fired with oil having a heating value of 135,000 btu/gallon. What is the fuel consumption rate for this bo
The gas turbine burns natural gas with a heating value of 100,000 btu/therm. A therm of natural gas costs $1.50. What will it cost per hour to operate this system? Assume ideal Brayton cycle for the
Estimate the theoretical kW electrical demand that this motor will draw when the refrigeration cycle is running at full capacity.
Saturated steam at 2 MPa is contained in a piston-cylinder device. The initial volume is 0.25 m3. Determine the quality of the steam at the final state.
A paddle wheel within the cylinder is rotated until 15 kJ of work is done on the air while the pressure is held constant. Determine the final temperature of the air.
Calculate the efficiency if a reheat loop was added at such that the steam leaves at 1 MPa and reenters the turbine at 450C.
Find the power input to the compressor. Suppose on an actual compressor the exit temperatureis found to be 447C. Find the adiabatic efficiencyof this compressor.
Heat is then slowly removed from the nitrogen during a constant pressure process until the temperature of the nitrogen is 300K. Calculate the work done by the nitrogen gas.
Liquid water is cooled at a constant pressure of 200 kPa in a piston-cylinder device from a temperature of 110 °C to a temperature of 30 °C. Determine the change in entropy.
The oil is contained in a well-insulated cylindrical tank that has a diameter of 1 m and a height of 1 m. What is the total entropy change (kJ/K) for the system comprising of steel and oil?
Calculate work per unit mass by incorporating an Ideal (polytropic, n=1.35) two stage compression process. Calculate the work per unit mass with isentropic,single stage compression.
The total mass of the car and its water "fuel" will be 5 kg. If you want the car to achieve a maximum speed of 3 m/s, what part of the total mass must be water?
Liquid water is cooled at a constant pressure of 200 kPa in a piston-cylinder device from a temperature of 110 °C to a temperature of 30 °C. Find the work done during the process, in kJ/kg.
Air at 80 kPa, 300 K, and 250 m/s enters a diffuser at a rate of 2.5 kg/s and leaves at 315 K. The exit area of the diffuser is 400 cm^2.
If the temperature of the inner and outer surfaces of the bottom of the pan are 104oC and 106o, determine the rate of entropy generation within the bottom of the pan.
Analyze for phases present at 100 degrees above the reaction temperature, for their compositions and amounts in the steel.
Carnot refrigerator which removes heat from a cooled space at -20C at a rate of 320 kJ/min and rejects it to the same environment at 300 K. Determine the net work supplied to the refrigerator.