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.
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Physics, 23.06.2019 10:30
Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery
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Physics, 23.06.2019 13:00
Apendulum has 592 j of potential energy at the highest point of its swing. how much kinetic energy will it have at the bottom of its swing?| units:
Answers: 1
Asatellite in geostationary orbit is used to transmit data via electromagnetic radiation. the satell...
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