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Two satellites   S subscript 1and  S subscript 2 are revolving around the earth in coplanar concentric orbits in the opposite sense. At t = 0, the positions of satellites are shown in the diagram. The period of S subscript 1 and S subscript 2
are 4 h and 24 h, respectively. The radius of orbit of S subscript 1 is 1.28 cross times 10 to the power of 4. For this situation mark the correct statement(s)

  1. The angular velocity of S subscript 2are observed by  s subscript 1 at space t equals 12 h text  is  end text 0.486 pi rads to the power of negative 1 end exponent    
  2. The two satellites are closest to each other for   the first time at t=12 h and then after every 24 h  they are closest to each other. 
  3. The orbital velocity of straight s subscript 1 text  is  end text 0.64 pi cross times 10 to the power of 4 km
  4. The velocity of S1 relative to S2 is continuously   changing in magnetic and direction both 

The correct answers are: The angular velocity of S subscript 2are observed by  s subscript 1 at space t equals 12 h text  is  end text 0.486 pi rads to the power of negative 1 end exponent, The two satellites are closest to each other for   the first time at t=12 h and then after every 24 h  they are closest to each other., The orbital velocity of straight s subscript 1 text  is  end text 0.64 pi cross times 10 to the power of 4 km, The velocity of S1 relative to S2 is continuously   changing in magnetic and direction both


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