Hi could you please help me with these Physics questions below?

Posted on 2016-02-29 19:05:00 in Physics by ANGELICA

The Mass of earth= 5.98x10^24kg 
The Mass of the moon= 7.36x10^22 
The Mass of the sun= 1.99x10^30 

Distance from earth to the moon= 3.84x10^5 
Distance from sun to the earth= 1.50x10^11 

The formulas my Physics teacher is having us use is g= GM/r^2 and Fg= Gm1m2/r^2 

G always = 6.67x10^-11 

1. Determine the force the sun exerts on an object with a mass of 80.0kg if the object is on earth? What is the force exerted by the moon of the same object? The Earth? 

2. If a person weighs 882N on earth at what altitude above earth's surface must they be at for their weight to drop to 800N? 

3. If the mass of two objects is doubled but the distance stays the same what happened to the gravitational force (Fg) between them? 

4. What happens to the force of attraction between to object of the same mass if the distance between them is doubled? 

(( The last two should be conceptual questions, but I believe they will be on my quiz and I'm not sure of the answer ))

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