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Water at 24 degree C flows at 0.8 m/s in a smooth, 1.5 cm I.D. tube that is kept at 27 degree C. The system is extremely clean and quiet, and the flow stays laminar until a noisy air compressor is turned on in the laboratory. Then it suddenly goes turbulent. Calculate the ratio of the turbulent h to the laminar h. [hturb = 4429 W/m2K.]
a circular sheet metal duct carries refrigerated air to a cold storage room for apples. the duct itself is 200 mm in
a poly-dispersed aerosol consists of spherical particles within the size range 1.0-10.0 micrometers. the particles are
a gas refrigeration system composed of a turbine a compressor and two heat exchangers is operating at steady state. air
in a water heating system cold water at 5 c flowing at a rate of 5 kgs is mixed adiabatically with hot water at 80 c
a wind turbine with a swept area of 1000 m2 operates with 56 efficiency under stp conditions. at the location of the
a mass of 2.4 kg of air at 150 kpa absolute and 12 degrees celsius is contained in gas tight frictionless piston
the truck at b is used to hoist the cabinet up to the fourth floor of a building using the rope and pulley arrangement.
the solid a-36 steel shaft has a diameter of 0.75 inches. if it is subjected to the torques shown determine the max
The 60-mm diameter shaft rotates at 300 rev/min. this motion is caused by the unequal belt tensions on the pully of 800 N and 450 N. Determine the power transmitted and the maximum shear stress developed in the shaft.
air is compressed in a steady-flow compressor via a polytropic process from 15 psia and 60 degrees f state 1. to 75
a solar thermal engine operating between 20 degrees celsius and 200 degrees celsius has efficiency equal to one-half of
a 20 kg object is pulled across a flat surface with a force of 100 n. the force is applied at a 30deg angle to the
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