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# gravitation force at a distance?

a space craft at 3.2x10^5 meters given the radius of earth of 6380 Km. no more details were given. how can i find the gravitational force that act on the space craft?  You were not given enough information to find the gravitational force.

The formula for gravitational force is:

F = GMm/rÂ²

Where:

G = Universal Gravitational constant (you can find it in a table or anywhere on the internet).

M = Mass of earth (you can look that up too, although I'm surprised they did not give it to you since they told you the earth's radius.)

m = mass of spacecraft (NOT GIVEN!!)

r = distance from earth's center (this would be 6380 km + 3.2 Ã 10^5 m; or: 6700 km).

If you don't know the mass of the space craft, you can't solve this problem.

[EDIT: The method proposed by "right hand of doom" will not work. That's not how the math works. The formula he gives will tell you the space craft's acceleration; not the force.] Newton's theory of gravity - gravitational force equals the product of the masses of the two objects, divided by the distance between them, and multiplied by a constant.

So if you have the two object's mass, the distance dividing them, and the constant, you should be able to calculate the gravitational forces.

But if they didn't give you the mass of either the craft or the Earth, I think you're screwed...