Physics

Solution Library


Determination of Velocity Direction on a Spherical Triangle

Question For this, we construct a spherical triangle (a triangle drawn on the surface of a sphere). The triangle has three vertices, at the Geographical North Pole (N), the Euler Pole (P) for the motion we are interested in, and at the point (X) for which we want to calculate that motion. Here is a ... Read More

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Necessity of Each Term on a Spherical Triangle

Question For this, we construct a spherical triangle (a triangle drawn on the surface of a sphere). The triangle has three vertices, at the Geographical North Pole (N), the Euler Pole (P) for the motion we are interested in, and at the point (X) for which we want to calculate that motion. Here is a ... Read More

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Determination of the Present Day Relative Motion on the Peru-Chile Trench

Question For this, we construct a spherical triangle (a triangle drawn on the surface of a sphere). The triangle has three vertices, at the Geographical North Pole (N), the Euler Pole (P) for the motion we are interested in, and at the point (X) for which we want to calculate that motion. Here is a ... Read More

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Determination of Present-day Relative Motion in the Red Sea

Question For this, we construct a spherical triangle (a triangle drawn on the surface of a sphere). The triangle has three vertices, at the Geographical North Pole (N), the Euler Pole (P) for the motion we are interested in, and at the point (X) for which we want to calculate that motion. Here is a ... Read More

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Reasons for Astronauts not Being Able to Cook in Space

Question The temperature of the thermosphere can reach 2000 K. Why aren’t astronauts cooked as they “walk” in space? Summary This question belongs to geophysics and discusses about reasons for astronauts not being able to cook in space. Total word count: 110   ... Read More

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Calculation of Density of Air at given Velocity at Certain Height

Question What is the density of air at 100 km if the atmosphere has a scale-height of 8 km? Summary This question belongs to geophysics and discusses about the density of air at given velocity if the atmosphere has a certain scale-height. Total word count: 38   ... Read More

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Effects of Major Solar Flare on Dayside Ionosphere

Question What effect would a major solar flare, which emits a large amount of UV and X-ray radiation, have on the dayside ionosphere? Summary This question belongs to geophysics and discusses about effects of major solar flare. Total word count: 97   ... Read More

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Calculation of Minimum Plasma Density during the Blackout of a Satellite

Question A satellite re-entering Earth’s atmosphere will suffer a radio communications blackout because of the plasma created by the shock wave in front of it. If the satellite’s radio operates at a frequency of 100 MHz, what is the minimum plasma density during the blackout? Summary ... Read More

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How Space Weather Impacts Airlines

Question Describe how space weather impacts airlines. Summary This question belongs to geophysics and discusses about how space weather impacts airlines. Total word count: 126   ... Read More

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Advantages and Disadvantages of LEO and GEO for Communication

Question The type of orbit (LEO, MEO, HEO, or GEO) a satellite is in depends on its purpose. What are the advantages and disadvantages of LEO and GEO for communication and Earth-observing purposes? Summary This question belongs to geophysics and discusses about the advantages and disadvantages of ... Read More

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Calculation of Centre of Mass of the Earth–Moon System

Question Where is the centre of mass of the Earth–Moon system? (mEarth = 6 .1024 kg; mMoon = 7 . 1022 kg; distance between Earth and Moon =385 000 km). Summary This question belongs to geophysics and discusses about the calculation of centre of mass of the Earth–Moon system. Total wo ... Read More

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Ways in which Radiation is used for Medical Purposes

Question Name and describe two ways in which radiation is used for medical purposes. Summary This question belongs to geophysics and discusses about the ways in which radiation is used for medical purposes. Total word count: 61   ... Read More

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