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

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

1.	If g on the surface of the earth is 9.8m//s^2, find its value at a height of 6400 km. (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=2.45 "m//s"^2`