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Ammonia enters a valve as saturated liquid at 9 bar and undergoes a throttling process to a pressure of 2 bar. Determine the rate of entropy production per unit mass of ammonia flowing, in kW/(kg·K). If the valve were replaced by a power-recovery turbine operating at steady state, determine the maximum theoretical power that could be developed per unit mass of ammonia flowing, in kJ/kg, and comment. In each case, ignore heat transfer with the surroundings and changes in kinetic and potential energy.
an engine undergos an expansion process that has an initial pressure of 1000 psia and volume of 0.008 ft3. the volume
The rocket car below is thrusting so that at constant thrust (force) , it reaches a velocity of 500 km/hr in 30 seconds. How much thrust is this (kN)? Determine the moment around the front axel M, while thrusting.
the 6 x 12 in timber beam has been strengthened by bolting to it thenbsp5 x ? in steel reinforcement shown. the modulus
the main bearing on an engine crankshaft is lubricated with engine oil. the torque due to friction t0 depends on shaft
the temperature inside a carnot refrigerator is maintained at 5 degrees c by rejecting heat to the surrounings at an
a venturi meter is inserted in a pipe whose diameter is 12 in. the diameter of the meter at its throat is 6 in. and the
the radiator of a car is a heat exchanger that uses air to cool the coolant assume water from the engine. the heat that
A liquid/vapor H2O mixture with 9.1 lb-m and a pressure of 1000 psia is heated at constant pressure until the temp is 600ºF. What is the final total enthalpy of the water, in BTUs?
Using standard transformations between Cartesian and Cylindrical coordinate systems
a steady flow compressor is used to compress helium from 100 kpa and 20 degrees celcius at the inlet to 1400 kpa and
You are a pilot of a plane fighting a forest fire, you are flying 1000ft above the ground at a speed of 90 miles per hour and are going to drop a 5000 pound load of fire suppressing chemicals onto the fire, how far from the front line of the fire mus..
3.33 kg of water fills a weighted piston cylinder device, at a temperature of 400 deg. C, The piston cylinder device now is cooled until is temperature is 170 deg C. Determine final pressure and volume of the water
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