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A variable mesh screen produces a linear and axisymmetric velocity profile as indicated in Fig. P5.70 in the airflow through a 2-ft-diameter circular cross-sectional duct. The static pressures upstream and downstream of the screen are 0.2 and 0.15 psi and are uniformly distributed over the flow cross-sectional area. Neglecting the force exerted by the duct wall on the flowing air, calculate the screen drag force.
In a non-flow process there is a heat loss of 1055kJ and an internal energy increase of 210kJ. How much work is done and is the process an expansion or compression?
a balanced wheel supported on springs is rotating at 1200 rpm. if a bolt weighing 15 g and located 5 cm from center
air undergoes a polytropic expansion process in a piston-cylinder assembly from 75 psia and 300 f to 15 psia. employing
½ kg of a liquid-vapor water mixture in a rigid tank initially at 2 bar is heated by 120V heater for 5 minutes until it becomes a saturated vapor at 4 bar. Changes in kinetic and potential energies can be ignored.
a blower develops 750mm of water gauge at a speed of 1480rpm and a flow rate of 38cubicmeter per sec. determine the
Determine the thermal efficiency of the cycle and the net specific work. Assume each turbine stage isentropic efficiency to be 99% and assume the FWH is open.
An open wind tunnel with altitude of 1000m has Pin=89,876Pa, Ain=4m^2, T=281.7K, Vin=30m/s and the test section Aout=0.5m^2, Vtest=(X)m/s. R=287J/(Kg*K), density=1.1117kg/m^3 and dynamic viscosity=1.076E-05kg/m-s
Describe the relevant advantages and disadvantages of using steel, copper or plastic pipe for a distribution main. Determine the diameter of a suitable air main for the distribution of 6 m3 min-1 FAD.
One kilogram of air as an ideal gas executes a Carnot power cycle having a thermal efficiency of 60%. The heat transfer to the air during the isothermal expansion is 40 kJ. At the beginning of the isothermal expansion, the pressure is 700 kPa and the..
A bullet is fired horizontally into a wood block resting on a horizontal, frictionless surface. If the mass of the bullet is 0.02 Kg and the velocity is 600 m/s
The sum of the minor loss coefficient for the system is KL = 14.5. When the pump adds 40 kW to the water the flowrate is 0.20 m3 /s. Determine the pipe roughness.
A room heating system. Room temperature is measured and compared with the set point. If it is low, a valve of a steam radiator is opened; if it is high, the valve is shut.
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