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A 50 hp electric motor is powering a pump that operates for 8 hours a day for 360 days/year. For an industrial electrical rate of $0.045/kW-hr and a motor efficiency of 90%, (a) determine the yearly electrical cost to operate this motor. (b) Is it advisable to replace the motor with a new 95% efficient unit if the replacement cost (with trade in) is $5,000? Support your answer with an engineering analysis.
a steam compressor is used to increase the pressure of saturated water vapor at 1000 kpa to 1500 kpa. the flow rate is
gas with an initial volume of 0.36 m3 is slowly compressed to a final volume of 0.16 m3 by a process during which the
1. what happens to the cutting and thrust force as tool rake angle and cutting speed are increased?2. how does the
If the final pressure is 1.0 MPa, determine (a) the temperature (°C) at the final state and (b) the heat transfer (kJ) during this process.
Calculate the force required in direct extrusion of 1100-O aluminum from a diameter of 6 in. to 2 in. Assume that the redundant work is 30% of the ideal work of deformation, and the friction work is 25% of the total work of deformation.
two particles are moving along a straight line starting beginning from x0 0 with a velocity of v0 10 at time t 0.
steam at 160 bar 480degc enters a two-stage turbine operating at steady sate with a volumetricnbspflow rate of 800
conventional ceramics have a fracture toughness of about 5 while advanced ceramics may have 20. determine1 how larger
a turbine that is well insulated runs on air. at steady state air enters at 0.5 mpa and 727 c and expands
heat treatment is common in processing semiconductor materials. a 200- mm-diameter silicon wafer with thickness of 725
In the paragraphs that follow, answers are provided to a number of key questions about desogestrel-only pills. What is the desogestrel-only pill?
air enters an insulated diffuser operating at steady state at 1 bar -3 degrees c and 260 ms and exits with a velocity
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