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Solution


Q.

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then,          [2015]
1 the linear momentum of S remains constant in magnitude  
2 the acceleration of S is always directed towards the centre of the earth  
3 the angular momentum of S about the centre of the earth changes in direction, but its magnitude remains constant  
4 the total mechanical energy of S varies periodically with time  

Ans.

(2)

The gravitational force on the satellite S acts towards the centre of the earth, so the acceleration of the satellite S is always directed towards the centre of the earth.