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Application: The dipole antenna. A dipole antenna is 1 m long and is fed with a current of amplitude 2 A. Find the radiated power of the antenna:
(a) At 540 kHz (lowest AM band frequency).
(b) At 1.6 MHz (highest AM band frequency).
(c) To what do you attribute the difference between the radiated powers in (a) and (b)?
a motorist traveling along a straight portion of a highway is decreasing the speed of his automobile at a constant rate
If the COP of the heat pump is 2.8, determine the power the heat pump draws when running.
A flat bar is to be rolls but the rolls refuse to bite (the bar is not drawn into the roll gap). State at least two measures that could be taken.
a drum rools on a conveyor with is moving at a constant velocity of 3fts. the drum rolls without slipping on the
the reynolds number of a fluid flowing through a 5-cm-diameter, square-edged orifice plate meter within a 15-cm pipe is 250,000. Find the discharge coefficient for flange taps.
In a car engine gasoline (assume octane C8H18) is evaporated and then mixed with air in a ratio of 1:15 by mass. In the cylinder the mixture is at 750 kPa, 650 K when the spark fires. For that time find the partial pressure of the octane and the spec..
Knowing that the co efficient of static friction is 0.20 at both B and C, find the range of values of the ratio L/a for which equilibrium is maintained.
To what value does this series converge when t = 1
Consider the following Dornbusch model under perfect foresight
a rigid tank has a volume of 0.06m3 and initially contains a two-phase liquid-vapour mixture of h2o at a pressure of 15
a newly developed diagnostic test indicates that 80 of students predicted to score 100 on an exam actually do. the
consider a reheat cycle with steam leaving the boiler and entering the turbine at 4 mpa and 400 c . after expanded in
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