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Question: A uniformly illuminated rectangular aperture situated in the x-y plane is 2 m high (along x) and 1 m wide (along y). If f = 10 GHz, determine the following:
(a) The beam widths of the radiation pattern in the elevation plane (x-z plane) and the azimuth plane (y-z plane).
(b) The antenna directivity D in decibels.
According to recent test data, an automobile travels 0.250 mi in 19.9 s, starting from rest. The same car, when braking from 60.0 mi/h on dry pavement, stops in 146 ft. Find the acceleration of this car when it is speeding up
A 50 kg bag of sand at 25 C falls 10 m onto the pavement and comes to an abrupt Stop. What is the change in internal energy in the sand
A golf ball is struck at ground level. The speed of the golf ball as a function of the time is shown in the figure, where t = 0 at the instant the ball is struck. What is the maximum height above ground level attained by the ball
Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 1.9M? measured among two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.4c..
We are focused on microevolution, or small changes within a species/population of organisms over a relatively short period of time.
a car started at point a and traveled around the track in a clockwise direction. point b is halfway around the track.
a flat sheet ofcrown glasshas a thickness of 2.2cm. it is on top of a flat sheet of crystalline quartz that has a
A wire is drawn through a die, stretching it to 4.1 times its original length. By what factor does its resistance increase
A circular conducting loop is held fixed in a uniform magnetic field that varies in time according to B(t) = B0exp(−a t) where t is in s, a is in s−1 and B is the field strength in T at t = 0. At t = 0, the emf induced in the loop is 0.0661 V. At t =..
You are to consider the quantum states of an electron confined to a linear regime of length L = 1nm. Find the wavelength of light (in nm) that would be absorbed
An elevator and its load have a combined mass of 1600 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 11 m/s
A firefighter a distance d from a burning building directs a stream of water from a fire hose at angle ?i above the horizontal, at what height h does the water strike the building
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