Physics, 27.11.2019 05:31 cdvazquez727
Asatellite in geostationary orbit is used to transmit data via electromagnetic radiation. the satellite is at a height of 35,000 km above the surface of the earth, and we assume it has an isotropic power output of 1 kw (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 surface area of 5 cm2.how large does the radius r of the dish have to be to achieve an electric field vector amplitude of 0.1 mv/mat the receiver? 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 r refers to the projection of the dish into the plane perpendicular to the direction of the incoming signal.
Answers: 1
Physics, 22.06.2019 09:40
When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.
Answers: 1
Physics, 22.06.2019 17:30
This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.
Answers: 1
Physics, 23.06.2019 00:00
You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked
Answers: 2
Asatellite in geostationary orbit is used to transmit data via electromagnetic radiation. the satell...
Mathematics, 31.01.2020 15:50
Mathematics, 31.01.2020 15:50
Social Studies, 31.01.2020 15:50
Social Studies, 31.01.2020 15:50
Chemistry, 31.01.2020 15:50
Mathematics, 31.01.2020 15:50
English, 31.01.2020 15:50
Mathematics, 31.01.2020 15:50
Mathematics, 31.01.2020 15:50
English, 31.01.2020 15:50
History, 31.01.2020 15:50