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Model a cup of coffee as a closed system containing 1 lbm of pure water at constant pressure of 14.7 psia. Using your knowledge of the 2nd Law, prove that it would be impossible for coffee at room temperature of 70 °F to heat up to 120 °F by receiving heat from the surroundings at 70 °F . Your proof should include all necessary thermodynamic calculations.
The flow around a model of a turbine blade is investigated. The model is five times larger than the prototype. A maximum pressure of 4 psi is measured at the leading edge, a maximum velocity of fps is measured near the top of the blade, and a small d..
an adiabatic turbine operates by accepting superheated water steam at 8 mpa and 500degc at a mass flow rate of 2 kgs.
an adiabatic turbine handles air as the operating fluid such that the air is expanded from 2 mpa and 327 degc to 200
a steel plate which is 1.5 m by 1.5 m and 30 mm thick is lifted by four cables attached to its corners that meet at a
determine the required diameter for the uniaxial tensile loaded two-force component if the failure criterion is
A compressor receives 0.1 kg/s R-134a at 150 kPa, -10C and delivers it at 1000 kPa, 40C. The power input is measured to be 3 kW. The compressor has heat transfer to air at 100 kPa coming in at 20C and leaving at 30C (i.e. like a heat exchanger). What..
A block is L = 1 [m] long and h = 0.5 [m] tall and weighs 50 [N]. The box is allowed to rotate about point A. A rope is attached to the upper left corner. This rope makes a θ=40° angle from the horizon. A horizontal force of 30 [N] is applied at th..
the 10-kg mass a is moving at 5 ms when it is 1 m from the stsaionary 10 kg mass b. the coefficiient of kinetic
two water reservoirs a and b are connected to each other through a 40 m long 2 cm cast iron pipe with a sharp-edged
A closed system consisting of 1 lb of a gas undergoes a process during which the relation between pressure and volume is pV^n = constant. The process begins with p1=20 lbf/in^2, V1=10ft^3 and ends with p2=100 lbf/in^2.
A golden bar of metal (5 centimeters by 18 centimeters by 4 centimeters) being transported by armored car is suspected of being fake, made from a less valuable metal with a thin coating of pure gold. The bar is found to have a mass of 2.7 kilograms. ..
1 a cylinderpiston contains a saturated vapor r-410a at 10 c the volume is 10 l. the r-410a is compressed to 2mpa 60 c
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