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Solution


Q.

If a satellite orbits as close to the earth’s surface as possible
1 Its speed is maximum  
2 Time period of its revolution is minimum  
3 The total energy of the ‘earth plus satellite’ system is minimum  
4 The total energy of the ‘earth plus satellite’ system is maximum  

Ans.

(1,2,3)

For (A): Orbital speed vo=GMr,

For (B): Time period of revolution T2∝r3

For (C/D): Total energy=-GMm2r