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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.
If electrons are accelerated from rest in an electron gun by sending them through a potential difference of 11.0 kV, what is the resulting kinetic energy of each electron?
Once you have a focused image on your screen, move the lens closer to the bulb and move the screen to find the image once again. What is the behavior of the image distance? What happens if you position the lens so that the bulb is near the focal p..
An electric vehicle starts from rest and accelerates at a rate of 2.4 m/s2 in a straight line until it reaches a speed of 14 m/s. How much time elapses from start to stop
Suppose you are given two bars, one is anelectric dipole and the other is a magnetic dipole. Can you think of some simple experiments that would help you figure out which is which using a battery or a balloon?
In many locations, such as Lake Washington in Seattle, floating bridges are preferable to conventional bridges. Such a bridge can be constructed out of concrete pontoons, which are essentially concrete boxes filled with air, Styrofoam, or another ..
A thermos contains 150 cm3 of coffee at 850C. To cool the coffee, you drop two 11 gram ice cubes into the thermos. Compute the final temperature of the coffee
The practical limit for carbon-14 dating is about 60,000 years. If a bone contains 1.4 kg of carbon, and the animal died 55000 years ago, what is the activity today
a tank having a volume of 0.100 m3 contains helium gas at 140 atm. how many balloons can the tank blow up if each
A tube of mercury with resistivity 9.84*10^-7 *m has a 23 N/C electric field inside the column of mercury. How much current is flowing, if the diameter of the tube is
A system consisting of one positively charged particle and onenegatively charged particle is altered by an outside force so thatits potential energy increases by 6.25 mJ. There is no changein kinetic energy between the initial and final states of ..
A girl is standing at the edge of a cliff 145 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.79 m/s. How long does it take the rock to hit the ground
What is the current in the loop when the magnet is between 0s and 1 s? What is the current in the loop when the magnet is between 1 s and 2s?
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