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A rectangular antenna has a height of 3m and a width of 6 meters. It operates at a frequency of .5 GHz.
What are the two half-power angles?
What are the angles between the first nulls in both directions?
What is the gain (over an isotropic source) of this antenna?
Suppose the efficiency is less than one. How would it affect the gain?
The Stanford Linear Accelerator (SLAC) is an electron accelator that provides an oscillating \radio-frequency" (RF) electric field in the form of a wave that stays in synchronism with the electrons being accelerated.
At a factory, a noon whistle is sounding with a frequency of 497 Hz. As a car traveling at 84km/h approaches the factory, driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change i..
What would happen to the gravitational force between Earth and the Sun. A reconnaissance plane flies 600 km away from its base at 240 km/h, then flies back to its base at 320km/h.
An electron has an initial velocity of 3.50 106 m/s in the x direction. It enters a uniform electric field = (400 N/C) , which is in the y direction. (a) Find the acceleration of the electron.
Two inductors L1 = 1.17 H and L2 = 2.13 H are connected in parallel and separated by a large distance so that the magnetic field of one cannot affect the other, Calculate the equivalent inductance.
Water at 22.0 °C is sprayed onto 0.203 kg of molten gold at 1063 °C (its melting point). What is the minimum mass of water that must be used
assume a bar 2 m long expands 0.6 cm when heated. By how much will a bar 100 m long of the same material expand when similarly heated.
Objects A and B are both positively charged. Both have a mass of 138 g, but A has twice the charge of B. How large is the electric force (in N) on A
a wheel is spinning freely on its axis with an angular velocity w of 2 rad/s. What is its renitic energy if the angular velocity is increased to 10 rad/s
A 1 cm3 air bubble at a depth of 280 meters and at a temperature of 4 oC rises to the surface of the lake, what is its new volume? How many micromoles (to 1 decimal place) of air are in the bubble
For the motion along the inclined plane, should the maximum kinetic energy of the cart be equal to the potential energy of the compressed spring (under ideal conditions)?
A 4.35-g bullet is moving horizontally with a velocity of +342 m/s, where the sign + indicates that it is moving to the right, What is the velocity of the second block after the bullet imbeds itself
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