Calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 8600 km above the earth's surface.

Since the force is inversely proportional to the square of the distance,

it will be g * (R/(R+8600))^2

where R is the earth's radius.

To calculate the effective value of g, the acceleration of gravity at a certain height above the Earth's surface, we need to use the formula for gravitational acceleration:

g = G * (M / r^2)

Where:
- g is the acceleration due to gravity
- G is the gravitational constant (approximately 6.67430 x 10^-11 N(m/kg)^2)
- M is the mass of the Earth (approximately 5.972 x 10^24 kg)
- r is the distance between the center of the Earth and the object's location

In this case, we need to find the value of g at a height of 8600 km above the Earth's surface. To do this, we need to calculate the distance from the center of the Earth to the specified height:

r = R + h

Where:
- R is the radius of the Earth (approximately 6.371 x 10^6 meters)
- h is the height above the Earth's surface

So, plugging in the values:

r = 6.371 x 10^6 + 8.6 x 10^6

Now we can use the formula for g:

g = G * (M / r^2)

To calculate the value of g, you need to input these values into the formula and perform the necessary calculations.