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Air flows steadily through a constant-area duct. At section (1), the air is at 400 kPa (abs), 325K, and 150 m/s. As a result of heat transfer and friction, the air section (2) downstream is at 275 kPa (abs), 450 K. Calculate the heat transfer per kilogram of air between sections (1) and (2), and the stagnation pressure at section (2).
a hot dog can be considered to be a cylinder 12 cm long and 2 cm in diameter whose properties are rho 980 kgm3 cp 3.9
Wheel of radius r is driven by an arm OA. It is driving (without slip) wheel of a radius r2 which is fixed to a drum of radius r1. Load G is attached to the rope which winds on the drum. Calculate the speed of load G if the arm OA moves at n rev/m..
consider a concentric tube annulus for which the inner and outer diameter are 25 and 50 mm. water enters the annular
what is the cooling temperature range obtained by thermoelectric refrigeration?
A refrigerator with a COP of 3 removes 1.5 kW from the cold space at -9 °C while rejecting heat to the kitchen at 22 °C.
a piston-cylinder device initially contains 1.4 kg of refrigent-134a at 140 kpa and 20 degc. heat is now transferred to
Show that the spacing between (111) planes in the FCC structure is the same as the spacing (002) planes in the HCP structure. Imagine the atoms to behave as hard spheres.
A cooking pot whose inner diameter is 20 cm is filled with water and covered with a 4-kg lid. If the local atmospheric pressure is 101 kPa, determine the temperature at which the water starts boiling when it is heated.
air enters the compressor of an air-standard brayton cycle at 100kpa 300k with anbspvolumetric flow rate of 5m3s. the
A small droplet of liquid detergent, falling through air in a spray drying tower, has its diameter reduced as water evaporates from the surface. If we assume that the temperature of the liquid within the drop remains at 290 K and the dry air is at..
a hydraulic shear applies 2000 lb force to a wedge. it is used to shear plate steel to rough size. the shear has a 14
An air conditioner in the airport of Timbuktu runs a cooling system using R-410a with a high pressure of 1500 kPa and a low pressure of 200 kPa. It should cool the desert air at 45 degrees C down to 15 degrees C. Find the cycle COP. Will the syste..
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