Physics, 17.09.2019 20:00 braphi5609
Asimple model of propagation of radio waves in the earth’s atmosphere or ionosphere consists of a flat earth at z = 0 and a nonuniform medium with = (z) for z > 0. consider the maxwell equations under the assumption that the fields are independent of y and can be written as functions of z times e i(kx−ωt) . (a) show that the wave equation governing the propagation for z > 0 is d 2f dz2 + q 2 (z)f(z) = 0 where q 2 (z) = ω 2 c 2 (z) − k 2 and f = ey for horizontal polarization, and where q 2 (z) = ω 2 c 2 (z) + 1 2(z) d 2 dz2 − 3 4 2(z) d dz 2 − k 2 and f = √ ez for vertical polarization
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Physics, 22.06.2019 05:00
Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.
Answers: 1
Physics, 22.06.2019 07:00
Hen a gfci receptacle device is installed on a 20-ampere branch circuit (12 awg copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?
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Physics, 22.06.2019 07:00
The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse
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Physics, 22.06.2019 13:50
9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.
Answers: 1
Asimple model of propagation of radio waves in the earth’s atmosphere or ionosphere consists of a fl...
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