how do you calculate the gravitational field strength at an altitude of 1.5x10^4km above the earths surface? The mass of the earth is 5.97x10^24 and the radius of the earth is 6.38x10^6 .. what formula do i use, i dont know how to incorporate the altitude # .................

Question

how do you calculate the gravitational field strength at an altitude of 1.5x10^4km above the earths surface? The mass of the earth is 5.97x10^24 and the radius of the earth is 6.38x10^6  .. what formula do i use, i dont know how to incorporate the altitude # .................

anonymous · Answer

Gravitational field strength, E = Fg/m  [ it is numerically equal to acceleration due to gravity, but conceptually it is a different quantity ]
E = G*Me/(R+h)^2
Now, substitute the values.

anonymous · Answer

graviational field strength is the force experienced by a test mass which is infinitely small the test mass being considered of unit magnitude

anonymous · Answer

@shubham did you get 9.7 then ?

anonymous · Answer

Do you have problem understanding the equation I wrote or calculation ?

anonymous · Answer

its a question from my textbook and the answer is 087N/Kg but i can never get that answer ....

anonymous · Answer

Can you solve it here ... I mean the substitution and then solving ..

anonymous · Answer

nvm .. it worked !  thank you :)