Answers

2015-07-31T13:28:30+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
We just use the Newton's law of gravitation.  that is simple.
 
Let the Force of gravitation on an object of mass m at an altitude h from Earth's surface distance  be equal to F.

let  Radius of Earth = Re = 6400 km
      and mass of Earth be Me.

F = G \frac{M_e \ m}{(Re + h)^2}= mg'\\\\So\ g'=\frac{GM_e}{(R_e+h)^2}\\\\g=\frac{GM_e}{R_e^2}\\\\\frac{g'}{g}=(\frac{R_e}{R_e+h})^2=64/100\\\\So\ \frac{R_e}{R_e+h}=0.8

So the altitude = h=\frac{R_e}{4}=1600\ km


at a height of 1/4 th of Earth's radius..

3 5 3
click on thanks button above please