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## Homework Statement

An object of mass 40.0 kg rests on the surface of a planet with a mass of 8.2 x 10

^{22}kg and radius 3.6 x 10

^{5}m.

a) calculate the force of gravity acting on the object.

b) Determine the gravitational field strength "g" at the planet surface.

c) Calculate the force of gravity acting on the object if it is placed at a position 6.4 x 10

a) calculate the force of gravity acting on the object.

b) Determine the gravitational field strength "g" at the planet surface.

c) Calculate the force of gravity acting on the object if it is placed at a position 6.4 x 10

^{5}m above the planet's surface.## Homework Equations

Newton's law of universal gravitation:

F=G m

_{1}m

_{2}/r

^{2}