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General Physics for Competitive Exams

  • Concept of geo-stationary orbit was  suggested by "Arthu C Clarke".
  • Geo-stationary orbit is at a height of 36,000 KM from earth. 
  •  India's first communication satellite is "Apple".                                                                                                                                                                                     
  •  PSLV - Polar Satellite Launch Vehicle.                          
  •  PSLV can launch satellites in orbits at height 900   
  •  Cryogenic engines are used in GSLV.
  •  Satellite application center is in Ahmedabad.
  •  Liquid propulsion system centre is in Tiruvanantapuram.
  •  Periscope is used in submarines. It is in Z shape.
  •  Solid Carbon-Di-Oxide is called as dry ice.
  •  Minimum escape velocity for a rocket to be launched into space is 11.2 km/sec. 
  •  India's first launched geostationary communication satellite was "APPLE".
  •  First lady to set on space voyage is Swetlana Savitskaya.
  •  Communication satellites are placed  in parking orbits.
  • Time period of revolution of a satellite around a planet is independent of mass of satellite.
  •  Time period of a surface satellite of earth is 84.6 min or 1.4 hours.
  •  Apparent weight of a body in a satellite is zero.
  •  Worlds first woman astronomer is Valentina teriskova.
  •  The orbit in which a geostationary satellite moves is called parking orbit.
  •  Relative velocity of parking satellite with respective to earth is zero.
  •  Time period of revolution of geo-stationary satellite is 24 hours.
  •  Orbital linear velocity is about 3 Km-sec-1 .
  •  It should revolve from west to east in equatorial plane.
  •  For Geo-stationary satellite the time period is equal to rotation of earth about its axis.