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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?
Backlash is a nonlinearity, which is often displayed by robots having gear trans missions. Indicate why it is difficult to compensate for backlash by using sensing and feedback control. What are the preferred ways to eliminate backlash in robots?
a carnot engine operates between two reservoirs maintained at 400 degrees celcius673.15k and t2 respectively. the heat
air is compressed by an adiabatic compressor from 100 kpa and 20 degc to 1.8 mpa and 400 degc. air enters the
The point C on the connecting rod is 200 mm from the crankpin at A. At the position shown determine the velocity of the piston, the velocity of the point C and the angular velocity of the connecting rod.
A speaker driver can be modeled as a one degree of freedom forced system with damping. The mass of the moving cone is m=0.1 kg and the spring k=50000N/m.
Find the mass moment of inertia of a tool steel part.x1 = 126.0mm, x2 = 75.0mm
Select a correct statement of the first law of thermodynamics, and briefly explain why:
a long wire of diameter d 1 mm is submerged in an oil bath of temperature tinfin 25 c. the wire has an electrical
an exhaust fan in a building should be able to move 5 lbms air at 14.4 psia 68 f through a 1.25 ft diameter vent hole.
the thermal reservoirs for a carnot engine are two constant pressure steam lines one at th 300 c and one at tl of 25
a steel cylinder initially contains nitrogen gas at 200kpa and 25 c. the cylinder is connected to a suply line
Calculate the voltage output of a dynamic microphone when exposed to soundpressure levels of 70 and 90 dB if the open-circuit sensitivity of the microphone is -37 dB.
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