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Find the gravitation field at a distanc...

Find the gravitation field at a distance of 20000 km from centre of earth.
(Given `R_("earth") =6400km, M_("earth") = 6xx 10^(24)kg)`:

A

`1.53m//s^(2)`

B

`7.12m//s^(2)`

C

`3.06m//s^(2)`

D

`1.0 m//s^(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`g'=(GM)/(R^(3)).r`
`=(GM)/(R^(2)).(r )/(R )=g.(r )/(R )`
`=9.8 xx (2000)/(6400) =9.8 xx (20)/(64)=3.06 m//s^(2)`
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