If g on the surface of the earth is 9.8m//s^2find its value at a height of 6400km. (Radius of the earth = 6400km)

If g on the surface of the earth is 9.8m//s^2find its value at a heigh

1.	If g on the surface of the earth is 9.8m//s^2find its value at a height of 6400km. (Radius of the earth = 6400km)
Answer» Solution :LET G at a HEIGHT h be `g_h"" g_h(g)/(1+h/R)^(2)` h = 6400 km , R `= 6400 km , g =9.8 m//s^2` `g_(h)= (9.8)/((1+(6400)/(6400))^2)=(9.8)/((1+1)^2)=(9.8)/4=2.45m//s^2`