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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Gravitation Formulae Page 2

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Escape Velocity

6. Escape Velocity

a)

Ve =

Escape velocity of a body from the surface of the earth.

 

 

Ve =

 

 

Ve =

2R

 

 

Ve = Vc

Where, Vc is the critical velocity when body is orbiting very close to the surface of the earth.

 

b)

Ve =

Escape velocity when body is orbiting round the earth at height 'h' above the surface of the earth.

 

7. Total Energy

 

When body is orbiting around the earth at height 'h' above the surface of the earth

T.E. =
- K.E.
P.E. =
- 2 K.E.

where,

K.E. =

1

mVc2

=

GMm

 

 

2

2(R + h)

 

8. Mass of the Earth

 

M

= density (r)

 

V

M = V r

Mass of the earth M =

4

pR3r

 

3

 

9. Period of Geostationary Satellite

 

Period of geostationary satellite

= 24 hours

 

 

= 86,400 sec.

 

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