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Radiated power. An antenna produces an electric field intensity in the far field:
where β0 is the phase constant in free space, R is the distance from the source (antenna), and θ is the angle with respect to the vertical (z) axis. Calculate:
(a) The radiated time-averaged power density.
(b) The total time averaged power radiated by the antenna.
A pump draws benzene at 25°C from a tank whose level is 2.6 m above the pump inlet. The suction line has a head loss of 0.8 N·m/ N. The atmospheric pressure is measured to be 98.5 kPa(abs). Find the available NPSH. The vapor pressure of benzene is..
A high-strength cast-iron bar 8 in. in diameter is being turned on a lathe at a depth of cut d=0.050 in. The lathe is equipped with a 15-hp electric motor and has a mechanical efficiency of 80%. The spindle is 500 rpm. Estimate the maximum feed that ..
Solve the preceding problem if the internal pressure is 3.75 MPa, the diameter is 19 m, the yield stress is 570 MPa, and the factor of safety is 3.0
a flywheel can be considered as being composed of a thin disc and a rim. the rim weighs 322 lb and has diameters of 24
a regional power plant is updating one of its existing 25mw natural gas turbans with a new more efficient model as a
a closed system of mass 5.3 lb. undergoes a process in which there is a heat transfer of 215 ft-lbf from the system to
an isolated system consists of a closed copper vessel of mass 0.1 kg containing 1 kg of liquid water each initially at
three kg of air contained in a sealed deformable device at 150 deg c and 500 kpa is expanded to 150 kpa in an
A water pump delivers 3 hp of shaft power when operating. If the pressure differential between the outlet and the inlet of the pump is measured to be 1.2 psi when the flow rate is 8 ft3/s and the changes in velocity and elevation are negligible, d..
A trapezoid is submerged in water so that its flat surface is perpendicular to the free surface and shorter leg is 0.4m below the free surface as shown in Figure. Length of the shorter leg is 1.6m and longer leg is 2.8m. Height of the trapezoid is 1...
Determine the amount of steam produced per hour, if the total heat loss is 10% of the heat available for steam raising - What would be the new heat transfer area if the fluids were in parallel flow
determine the force in each member of the space truss and state if the members are in tension or compression. the truss
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