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A transmitter is located 1 OOm from a 28m high brick wall (εr = 4 ), while a receiver is located on the other side, 120m away from the wall. The wall is 20 cm thick and can be regarded as lossless. Let transmit antenna is 20m high and receive antenna is 14m high. The centre frequency is 900 MHz. Considering TE waves, determine the field strength at the receiver caused by transmission through the wall.
A ball is rolling up a hill with a smooth surface. Initial kinetic energy of the ball is equal to its potential energy on the top of the hill. How does the answer depend on the shape of the hill surface
explain why a capacitor acts as a short circuit at high angular frequencies and as an open circuit at low angular
A rock is shot vertically upward from the edge of the top of a tall building. with what upward velocity is the rock shot
A spherical 3-mi diameter comet impacts the earth with a velocity of 20 mi/s. Calculate the amount of heat released from the impact site
Consider laser eye surgery, in which laser light with a wavelength of 426 nm at a power output of 1.6 W is used to reattach a detached retina. how many photons are emitted by the laser
A 195 W (121 V) night light is turned on for an average 6.5 hr a day year round. What is the annual cost of electricity at a billing rate of $0.07 per kWh
Use the worked example above to help you solve this problem. Figure a shows a simple apparatus for demonstrating resonance in a tube. Find the wavelength and the next two air-column lengths giving resonance
A 1.0 N force is applied to the plunger of a hypodermic needle. The diameter of the plunger is 1.0 cm and that of the needle is 0.30 mm. With what force does the fluid leave the needle?
An "air" capacitor has an area of 2 cm2 with plates that are separated by a distance of 2 mm. How much charge does this capacitor store when it is connected to a 6 V battery
You have designed a rocket to be used to sample the local atmosphere for pollution. It is fired vertically with a constant upward acceleration of 18 m/s2. Compute the total time the rocket is in the air
A point charge with a charge q1 = 3.60 µC is held stationary at the origin. How much work is done by the electric force on q2
A gymnast of mass 55.0kg hangs from a vertical rope attached to the ceiling. Calculate the tension T in the rope if the gymnast hangs motionless on the rope
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