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Near and far fields of antennas. In preparation for a propagation experiment, a researcher places a field measuring instrument (another antenna) at a distance of 150 m from the transmitting antenna, which operates at 30 GHz. A colleague indicates that this is improper because the measuring instrument is not in the far field of the antenna. Is the instrument in the near or the far field of the transmitting antenna?
a boiler produces saturated steam at 100psig pressure. the feedwater condensate returning to the boiler is saturated
A sprue is 12 inches long and has a diameter of 5 inches at the top, where the metal is poured. The molten metal level in the pouring basin is taken as 3 inches from the top of the sprue for design purposes. If a flow rate of 40 in3/s is to be achiev..
an object whose mass is 50 lb attached to a rope wound around a pulley. the radius of the pulley is 3 in. if the mass
Carbon-dioxide gas at 3MPa and 500 K flows steadily in a pipe at a rate of 0.4kmol/s. Determine a) the volume and mass flow rates and the density of carbon dioxide at this state. If CO2 is cooled at a constant pressure as it flows in the pipe so that..
it is proposed to heat a home using a heat pump. the rate of heat transfer from the house to the environment is 15 kw.
The x and y components of velocity for a two-dimensional flow are u = 5y ft/s and v = 4 ft/s, where y is in feet. Determine the equation for the streamlines. Use C as constant. Round all numbers in answer to 3 significant digits.
1. The activation energy for the diffusion of cop- per in silver is 193,000 J/mol. Calculate the diffusion coefficient at 1200 K (927°C), given that D at 1000 K (727°C) is 1.0 X 10-14 m2/s.
1000 kghr of water at 1 bar is fed to a pump where the pressure of the water is increased to 20 bar in an adiabatic
two kg of a mixture having an analyis of on a mass basis of 30 nitrogen 40 carbon dioxide 30 oxygen is compressed
a 1kg mass connected to a horizontal spring of stiffness 1031 nm has a dry-sliding friction force of 2 n. the mass is
refrigerant 134a is the working fluid in an organic rankine cycle. saturated vapor at 60degc enters the turbine and the
the presence of raindrops in the air during a heavy rainstorm increases the average density of the air-water mixture.
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