Physics, 26.03.2020 20:03 randyg0531
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an rms value of T. The wave passes perpendicularly through an open window, the area of which is 0.35 m². How much energy does this wave carry through the window during a 34-s phone call?
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If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?
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Write down two additional questions about earth's magnetic field that will make your presentation more informative.
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What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.
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Asteel tube (k=50 w/mk) of inner and outer diameter di = 20mm and do=26mm, respectively, is used to transfer heat from hot gases flowing over the tube (h-hot = 200w/m2k) to cold water flowing through the tube (h-cold = 8000 w/m2k). what is the cold-side overall heat transfer coefficient uc? to enhance heat transfer 16 straight fins of rectangular profile are installed longitudinally along the outer surface of the tube. the fins are equally spaced around the circumference of the tube, each having a thickness of 2mm and a length of 15mm. what is the corresponding overall heat transfer coefficient uc? *solve for uc in both cases*
Answers: 1
The electromagnetic wave that delivers a cellular phone call to a car has a magnetic field with an r...
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