# Help on Gravity stuff

## Homework Statement

Use Newton's law of universal gravitation to find an equation where x is equal to an object's distance from Earth's center, and y is its acceleration due to gravity. Use a graphing calculator to graph this equation, using 6400-6600 km as the range for x and 9-10 m/s2 as the range for y. The equation should be of the form y = c(1/x2).
(a) Trace along this graph and find y at sea level, 6400 km.

(b) Trace along this graph and find y on top of Mt. Everest, 6410 km.

(c) Trace along this graph and find y in a typical satellite orbit, 6500 km.

(d) Trace along this graph and find y in a much higher orbit, 6600 km.

i got no idea how to solve any help or the answers would help greatly

For a start you could read
http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html

G= universal gravitational constant
M = mass of earth (a constant)
m = mass of your object (a constant)
g = gravitational acceleration experienced by the object (a variable)
r = distance of object from the centre of the Earth (a variable)

G*M*m/r*r = m*g

<< complete solution deleted by berkeman >>

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