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For the array and phase advance in Problem 4.2, calculate the distance from the tower in which nulls may occur in the radiation pattern.
Problem 4.2
If the 14 dBi antenna array described in Problem 4.3 is mounted on top of a 50 m tall tower, calculate the phase advance across the entire length of the array to ensure that the outer edge of the 3 dB beamwidth hits the ground at a distance of 1 km from the tower.
An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz. The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85-? resistor. What is the power factor for this circuit
The force on a weir is to be predicted by studying the flow of water over a 1:10 scale model. If 1.8 m3=s is expected over the weir, what flow rate should be used in the model study? What force should be expected on the weir if 20 N is measured on..
In the Bohr model of the hydrogen atom, an electron in the lowest energy state moves at a speed of 2.19x106 m/s in a circular path having a radius of 5.29x10-11 m.What is the effective current associated with this orbiting electron?
A particle of charge q = e moves in a circle of radius = 0.54 m with speed v = 1.000×107 m/s. find the maximum torque exerted on the loop by a uniform magnetic field of magnitude B = 1.00 T
Two identical small insulating balls are suspended by separate0.25-m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10-4 kg. Initiallythe balls are uncharged and hang straight down.
A stone is dropped from a cliff; 2.47 s later another stone is thrown downward with an initial speed of 35 m/s. Find the height of the cliff
a subatomic particle of mass m at rest decays into a photon with an energy of 38m moving in the x direction and a
During exercise, a person gives off 150 Calories of heat in 22 minutes. How much water would this amount of energy evaporate
A satellite mass 200 kg is launched from a site on earth's equator into an orbit 200 km above the earth's surface. Assuming a circular orbit, what is the minimum energy essential to be supplied in order to place the satellite in orbit from the surfac..
At a certain instant a particle (mass=0.5 kg) is moving in the +x direction with velocity 14 m/s. What is the magnitude of the momentum of the particle (in kg*m/s) at the end of this 0.15 second interval
Determine the specific solutions inside the well for the ground state and for the rst excited state by applying the boundary conditions at x = 0 and at x = L. Now consider a 50:50 superposition of the ground state and the rst excited state.
A 120.0-\Omega resistor, a 60.0-\Omega resistor, and a 40.0-\Omega resistor are connected in parallel and placed across a 12.0-V battery. What is the equivalent resistance of the parallel circuit? What is the current during the entire circuit?
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