Gravitational Attraction Between Two Balls

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Homework Help Overview

The discussion revolves around calculating the gravitational attraction between two balls, each with a mass of 6.3 kg and a radius of 0.11 m. The original poster attempts to apply the gravitational force formula but encounters an unexpected result.

Discussion Character

  • Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the correct distance to use in the gravitational force formula, questioning whether to consider the radius of the balls in the calculation. There is also mention of a related problem involving finding masses given a gravitational force.

Discussion Status

The discussion is exploring the correct interpretation of the distance between the centers of mass of the balls. Some participants suggest that the arithmetic should yield the correct answer if done properly, while others are considering different scenarios related to gravitational force.

Contextual Notes

There is mention of a potential trick question regarding the gravitational attraction calculation, indicating that assumptions about the setup may need to be revisited.

mikejonesss
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two 6.3 kg balls with radii of .11m are in contact w/ each other. what is the gravitational attraction b/w the balls.

radius = .11m
mass = 6.3kg

Fg = G*m1*m2/ [tex]r^2[/tex]

i just tried pluggging in the givens and somehow it's a trick question and i get the incorrect answer.
i shold be getting 5.47E-8.
 
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Last edited:
What is the distance between the centres of mass of the balls?
 
hmm .11m x 2?
 
mikejonesss said:
hmm .11m x 2?
Look's good to me. If you do the arithmetic correctly, you should obtain the correct answer.
 
yes. thank you. i also had a problem where the Fg is given and you have to find the masses. one mass is twice the other.
 

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