Question

A geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth's gravity at the site of this satellite? (Consider the P.E. at infinity to be zero.) Mass of the earth = 6 × $10^{24}$ kg Radius = 6400 km

Answer 1

Answer:

As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth's gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = 6.0×10

24

kg, radius = 6400 km.

ANSWER

Mass of the Earth,M=6.0×10

24

kg

Radius of the Earth, R=6400 km=6.4×10

6

m

Height of a geostationary satellite from the surface of the Earth, h=36000 km=3.6×10

7

m

Gravitational potential due to Earth's gravity at height h

V=−

R+h

GM

=−

3.6×10

7

+0.64×10

7

6.67×10

−11

×6×10

24

=−9.4×10

6

J/kg

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