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A 75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high efficiency motor that has an efficiency of 95.4 percent. The motor operates 4368 hours a year at a load factor of 0.75. Taking the cost of electricity to be $0.08/kWh, determine the amount of energy and money saved as a result of installing the high-efficiency motor instead of the standard motor. Also, determine the simple payback period if the purchase prices of the standard and high-efficiency motors are $5449 and $5520, respectively.
consider the steady operation of a refrigeration package for a shipping container on a train truck or ship. the package
a ship tracks an unmanned vehicle p in the water. relative a reference frame the recorded motion of p for the first t
A flow field for a fluid is described by u=(2+y) m/s and v=(2y) m/s, where y is in meters. Determine the equation of the streamline that passes through point (3m, 2m). Write the equation in the form x={x(y)}, where y is in meters.
A 7in diameter cylindrical scuba tank made from steel is being designed for an internal pressure of 1600 psi. The allowable stress of the steel is 35 ksi in tension and 16 ksi in shear. Calculate the minimum wall thickness assuming a factor of safety..
a platform of weight 200 lb supported by two springs each of constant k 250 lbin. is subjected to a periodic force of
highways are banked to increase the maximum safe speed at which cars can negotiate a turn. assume a road with radius of
A Carnot heat engine using 1 kg of air has the following conditions: isothermal heat. Addition beginning at 15 MPa and 1200 K and continuing until the pressure is 10 MPa;
steam enters a turbine at 120 bars and 440 0c and expands to 1 bar. at the exit entropy is 0.650 kjkg. k greater than
in a 150 mw steam turbine unit operating on an enhanced rankine cycle steam is delivered from the boiler to the high
a furnace is shaped like along semicylindrical duct of diameter 15 ft. the base and the dome of the furnace have
a cylinder of radius a is balanced on top of a fixed cylinder of radius b b gt a . if the balance is slightly
a thin-flat plate having a length of l 10 cm is heated by a constant-heat flux from the bottom and cooled by an air
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