Showing 487–495 of 728 results
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What is the allowed range of mass flow rates for the water
$1.00Oil Enters a counterflow heat exchanger at 450k with a mass flow rate of 10 kg/s and exits at 350k. A seperate stream of liquid water enters at 20 C, 5 bar. Each stream experiences no significant change in pressure. stray heat transfer with the surroundings of the heat exchanger and kinetic and potential energy effects can be ignored. the specific heat of the oil is constant, c=2 kJ/kg k. if the designer wants to ensure no water vapor is present in the exiting water stream, what is the allowed range of mass flow rates for the water, in Kg/s
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Jimmy and Dave: Enemies That Started as Friends (Comparing and Contrasting Mystic River)
$37.50Essay 2: Comparing and Contrasting Mystic River
Purpose: Comparing and contrasting is an important academic skill. It allows writers to draw rich connections between disparate ideas and to hone broad ideas to a sharp focus. But comparing and contrasting also poses a unique set of organizational challenges. In this assignment, you will practice thinking in terms of differences and similarities and presenting these differences and similarities in a balanced and organized way.
Assignment: Write a thesis-driven argument of 5-7 pages in which you compare and/or contrast the novel Mystic River with the film version directed by Clint Eastwood. You should acknowledge and respond to a minimum of two critical (secondary) sources.
Comments: As you shape your comparison / contrast, you should deepen your argument with research. What relevant background can you give about the novel and film? Who else has written about them? Do you agree with them? Disagree? Both?
You should move gradually from a working thesis that aspects of the the novel or film are superior to a more specific thesis that explicitly states your major reasons. We’ll have a thesis workshop in class.
You are charged with evaluating the literature, so do not hesitate to make claims about the quality of the texts you examine, backing up these claims with clear reasons and convincing evidence.
Make sure to be fair and objective when stating an opposing claim. Feel free to concede any points you cannot disprove. Use a “devil’s advocate” position (summarize an imaginary opposing argument as in “A reader might argue that . . . ”) only if you cannot find a real source with an opposing argument. You could present the opposing argument before your refutation (as in a “classical argument”) or after you state and argue for your own position.
Use the library’s indexes and databases rather than Google, Yahoo, or Wikipedia (see the class library page on our Blackboard site for links).
7 pages
MLA 5 References
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Calculate the percentage efficiency at rated load
$1.00The following data applies to a 100kW, 250V, 6 pole, 900 RPM,long-shunt, compound DC generator: No-load rotational loss = 3,480WattsArmature resistance = 0.012 ohmsSeries field resistance = 0.008 ohmsShunt field current = 2.6 AAssume a stray-loss equal to 1% of the output. Calculate the %efficiency at rated load.The answer becomes 92.2% but please show the steps arriving to the answer. -
Determine the net power developed
$1.00
Figure P6.165 shows a simple vapor power plant operating at steady state with water as the working fluid. Data at key locations are given on the figure. The mass flow rate of the water circulating through the components is 109 kg/s. Stray heat transfer and kinetic and potential energy effects can be ignored. Determine the net power developed, in MW. the thermal efficiency. the isentropic turbine efficiency. the isentropic pump efficiency. the mass flow rate of the cooling water, in kg/s. the rates of entropy production, each in kW/K, for the turbine, condenser, and pump. Fig. P6.165
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Determine mechanical power developed
$1.00A 40hp, 50Hz, 2300V, 8-pole induction motor is operating at 80% rated load and 6% reduced voltage. The efficiency and power factor for these conditions are 85 and 90% respectively. The combined windage, friction, and stray power losses are 1011W, the rotor conduction losses are 969W, and the stator conductor losses are 1559W. Sketch the power flow diagram, enter values, and determine
(a) mechanical power developed;
(b) shaft speed;
(c) shaft torque;
(d) slip speed;
(e) line current;
(f) core loss
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Determine the mass flow rate of the helium, in kg/s
$1.00
Text: Steady-state operating data are provided for a compressor and heat exchanger in Fig. P4.103. The power input to the compressor is 50 kW. As shown in the figure, nitrogen (N2) flows through the compressor and heat exchanger with a mass flow rate of 0.25 kg/s. The nitrogen is modeled as an ideal gas. A separate cooling stream of helium, modeled as an ideal gas with k = 1.67, also flows through the heat exchanger. Stray heat transfer and kinetic and potential energy effects are negligible. Determine the mass flow rate of the helium, in kg/s.
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Unit Five Homework Solutions
$15.00- Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 10 MPa, 450oC, and 80 m/s. The exit conditions are 10 kPa, 92% quality, and 50 m/s. The mass flow rate of the steam is 12 kg/s. Determine (a) the change in kinetic energy, (b) the power output, and (c) the turbine inlet area.
- Argon gas enters an adiabatic turbine steadily at 900 kPa and 450oC with a velocity of 80 m/s and leaves at 150 kPa with a velocity of 150 m/s. The inlet area of the turbine is is 60 cm2. If the power output of the turbine is 250 kW, determine the exit temperature of the argon.
- Refrigerant-134a enters an adiabatic compressor as saturated vapor at -24oC and leaves at 0.8 MPa and 60oC. The mass flow rate of the refrigerant is 1.2 kg/s. Determine (a) the power input to the compressor and (b) the volume flow rate of the refrigerant at the compressor inlet.
- Refrigerant-134a is throttled from the saturated liquid state at 700 kPa to a pressure of 160 kPa. Determine the temperature drop during this process and the final specific volume of the refrigerant.
- Refrigerant-134a at 1 MPa and 90oC is to be cooled to 1 MPa and 30oC in a condenser by air. The air enters at 100 kPa and 27oC with a volume flow rate of 600 m3/min and leaves at 95 kPa and 60oC. Determine the mass flow rate of the refrigerant.
- Air enters the evaporator section of a window air conditioner at 14.7 psia and 90 oF with a volume flow rate of 200 ft3/min. Refrigerant-134a at 20 psia with a quality of 30% enters the evaporator at a rate of 4 lbm/min and leaves as a saturated vapor at the same pressure. Determine (a) the exit temperature of the air and (b) the rate of heat transfer from the air.
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Determine the power developed by the turbine for an expansion between these states
$1.00
Text: Air enters a turbine operating at steady state at 500 kPa, 860 K and exits at 100 kPa. A temperature sensor indicates that the exit air temperature is 460 K. Stray heat transfer and kinetic and potential energy effects are negligible, and the air can be modeled as an ideal gas. Determine if the exit temperature reading can be correct. It yes, determine the power developed by the turbine for an expansion between these states, in kJ per kg of air flowing. If no, provide an explanation with supporting calculations.
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Determine the power
$1.00
Text: As shown in Fig. P4.105, hot industrial waste water at 15 bar, 180degreeC with a mass flow rate of 5 kg/s enters a flash chamber via a valve. Saturated vapor and saturated liquid streams, each at 4 bar, exit the flash chamber. The saturated vapor enters the turbine and expands to 0.08 bar, x = 90%. Stray heal transfer and kinetic and potential energy effects are negligible. For operation at steady state, determine the power, in hp, developed by the turbine.