Asked by mc
                If you leave the radius of a planet the same but double its mass, how does the gravitational pull of the planet on a person (equivalent to the person's weight) change? If you leave the mass the same, but double the radius how does the gravitational pull  of the planet change?
thanks
            
        thanks
Answers
                    Answered by
            bobpursley
            
    Force=GMe*m/re^2
double M, double F
double re, F is 1/4 original
    
double M, double F
double re, F is 1/4 original
                    Answered by
            mc
            
    huh? we haven't learned any of these formulas..
    
                    Answered by
            mc
            
    SInce gravity gets weaker with distance, if you doubled the radius wouldn't you feel your weight less and less?
    
                    Answered by
            jolly rancher
            
    F = G*(M*m/r^2)
he's just saying that (according to a formula you've maybe never seen)
if you double the planet's mass (M in the formula) you will double the force due to gravity, because the relationship is linear
if you double the planet's radius, you will reduce the force due to gravity by a factor of 4, because r^2 is in the denominator
    
he's just saying that (according to a formula you've maybe never seen)
if you double the planet's mass (M in the formula) you will double the force due to gravity, because the relationship is linear
if you double the planet's radius, you will reduce the force due to gravity by a factor of 4, because r^2 is in the denominator
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