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The radius of the Earth rE is 6380km. What is the acceleration due to gravity at...

The radius of the Earth rE is 6380km.

What is the acceleration due to gravity at a distance 4rE above the Earth's surface?

What is the speed of a satellite in a circular orbit at the height 4rE above the Earth's surface?

How much time (in seconds) does the satellite take to complete an orbit? Assume that the satellite orbits at constant speed.

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Answer #1

Variation of Acceleration due to gravity with height is given by,

Here,   

Speed of a Geostationary satellite is given by,  

Where, R is the distance from the centre of earth, in Our case ,,  

M is the mass of earth ,

G is the universal gravitational constant,  

Time period for a satelleite is given by ,

  

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