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Revision QuestionsUseful Data:
Question 1 - If a typical UoSAT satellite's orbit is circular and at 800 km altitude, how fast does the launch vehicle have to be travelling to release the satellite into its intended orbit? Answer Explain Question 2 - Polar orbits are at right angles to the equator so polar orbiting satellites pass over the whole Earth surface in a day. What angle does the Earth rotate through in the time it takes a typical UoSAT satellite to orbit the earth? Answer Explain Question 3 - The European launch site is in French Guyana. What two advantages are there of launching a satellite from an Equatorial location? Answer Question 4 - If a satellite has coils on its solar panels which
have 550 turns on them and carry 0.5A and the solar panels measure 30
cm x 60 cm, what is the maximum torque that can be applied to them if
the Earth's magnetic field strength at Low Earth Orbit is Question 5 - Which regions of the satellite orbit would experience the strongest magnetic field? Answer Question 6 - The attitude of UoSAT satellites is partly controlled
by the gravity gradient effect - that is the natural tendency for long
thin objects to align themselves along the direction of the gravitational
field (i.e. the local vertical). SSTL make satellites 'long and thin'
by deploying a large lump of brass (~2 - 3kg) on the end of a long boom
(~6m). This turns the satellites into a dumbell configuration. Question 7 - A satellite is orbiting at 800 km above the Earth's surface. Calculate the period of orbit, the angular speed and the instantaneous linear speed. Answer Explain Question 8 - Geostationary satellites typically orbit once in 24 hours. What would be their orbit height above the Earth's surface and what is their instantaneous linear speed? Answer Explain |
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