Physics, 19.12.2019 00:31 CameronVand21
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/m at 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. give your answer in centimeters, to two significant figures.
Answers: 3
Physics, 21.06.2019 18:30
Which of these describe conduction transfer of heat between two objects that are touching transfer of heat by the actual movement of war matter the process in which energy is imitated by one of the object transmitted through space and absorbed by another a process in which energy is released by the molecules breaking apart
Answers: 1
Physics, 22.06.2019 07:50
Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?
Answers: 1
Physics, 22.06.2019 10:00
Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?
Answers: 2
Physics, 22.06.2019 10:20
Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.
Answers: 2
Imagine that the satellite described in the problem introduction is used to transmit television sign...
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