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A satellite in geostationary orbit is used to transmit data via electromagnetic radiation. The satellite is at a height of 3.1A????1104km , above the surface of the earth, and we assume it has an isotropic power output of 36.1kW , (although, in practice, satellite antennas transmit signals that are less powerful but more directional).
Imagine that the satellite described in the problem introduction is used to transmit television signals. You have a satellite TV reciever consisting of a circular dish of radius R which focuses the electromagnetic energy incident from the satellite onto a receiver which has a radius of 3.69 x 10-2 m.
For simplicity, assume that your house is located directly beneath the satellite (i.e. the situation you calculated in the first part), that the dish reflects all of the incident signal onto the receiver, and that there are no losses associated with the reception process. The dish has a curvature, but the radius Rrefers to the projection of the dish into the plane perpendicular to the direction of the incoming signal.
QUESTION
How large does the radius R of the dish have to be to achieve an electric field vector amplitude of 5.7 x10-4V/m , at the receiver?
The great gymnast Nadia Comaneci may have had a vertical leap as high as 1.42 m. Calculate the "takeoff" speed
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a charge +q = +7.50 uC is located in en electric field. The x- and y-components of the field are Ex = 6.00 x 10^3 N/C and Ey= 8.00 x 10^3 N/C respectively. What is the magnitude of the force on the charge
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Transverse waves with a speed of 59.0 m/s are to be produced on a stretched string. A 4.95-m length of string with a total mass of 0.0600 kg is used. (a) What is the required tension in the string? N (b) Calculate the wave speed in the string if t..
a line of charge with uniform density of 40.0 ncm lies along the line y -15.0 cm between the points with coordinates x
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