Find the gravitational force between then sun and the earth

  • #1

Homework Statement


1)Find the gravitational force between then sun (2*10^30 kg) and the earth (5.97*10^24 kg). Earths distance from the sun is 1.5 * 10^11m.

2) find the distance between a 5 kg object and a 10kg object if their gravitational force is 1*10^-4N.

Homework Equations


Fg= (G(m1)(m2))/r^2

The Attempt at a Solution


1) (6.67*10^-11)(5.97*10^24)(10)(5)/(1.5*10^11)^2= 3.50*10^22

2) (6.67*10^-11)(10)(5)(1*10^-4)/r^2=
√3.33*10^-13 =r^2

So... 5.77*10^-7


Yes... these "answers" may look chaotic which is why I am here for some assistance. :/
 

Answers and Replies

  • #2
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In doing question 1, where is the mass of the earth in the equation? What are the 10 and the 5 doing in the equation?
In doing question 2, the 1*10^-4 should be on the other side of the equation.

Chet
 
  • #3
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
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Homework Statement


1)Find the gravitational force between then sun (2*10^30 kg) and the earth (5.97*10^24 kg). Earths distance from the sun is 1.5 * 10^11m.

2) find the distance between a 5 kg object and a 10kg object if their gravitational force is 1*10^-4N.

Homework Equations


Fg= (G(m1)(m2))/r^2

The Attempt at a Solution


1) (6.67*10^-11)(5.97*10^24)(10)(5)/(1.5*10^11)^2= 3.50*10^22

Where is the mass of the sun in the equation above?
Where are the units of your answer?

2) (6.67*10^-11)(10)(5)(1*10^-4)/r^2=
√3.33*10^-13 =r^2

So... 5.77*10^-7


Yes... these "answers" may look chaotic which is why I am here for some assistance. :/
What is the factor 10-4 for?
What are the units of G?
You need to state the units with your answers, otherwise your calculations are incomplete and ambiguous.
 

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