What is the distance of the particle from mass A?

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SUMMARY

The discussion focuses on determining the distance of a small particle from mass A when placed between two bodies, A and B, with masses m and 2m, respectively, separated by a distance d. The net gravitational force on the particle is zero, leading to the equation Gm1m2/x² - Gm1m2/(d-x)² = 0. By simplifying the equation and substituting values, participants clarify that the particle's negligible mass does not affect the gravitational acceleration, which is calculated using g = (G * M) / d². The final solution involves setting the distance from A as x and deriving the corresponding distance from B.

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Homework Statement


Two bodies A and B having masses m and 2m respectively kept at a distance of d apart.
A small particle is kept between A and B such that the net gravitational force on the particle
is zero due to the bodies A and B . Its distance from mass A should be ?

Homework Equations

The Attempt at a Solution


x= distance of the particle from A
Fx+(-Fd-x)=Gm1m2/x2-Gm1m2/(d-x)2
after simplifying
Gm1m2d2-2dxGm1m2/dx2+x4-2dx3[/B]
 
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Remember that object A has mass m and object B has mass 2m. Try simplifying again and be more clear with how you represent your fractions.
 
"the net gravitational force on the particle is zero"

Where did you use this fact? Where is 0 in your equation?
 
assume the particle is of negligable mass, then the equation for gravitational acceleration is : g = (G * M) / d^2
use substitution, call the distance from A = 1, then find the distance B
 
dean barry said:
assume the particle is of negligable mass
Why? It does not matter what its mass is, the acceleration would be the same.
dean barry said:
call the distance from A = 1,
Mr.maniac called it x, which seems even better.
 

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