The Sun's Net Gravitational Force

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Homework Help Overview

The problem involves calculating the net gravitational force acting on the Sun due to other stars in the Milky Way galaxy, given the galaxy's rotation period and the Sun's distance from the center.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss converting the galaxy's rotation period into a speed to apply the centripetal force formula. There is mention of using radial acceleration in the calculations. Some participants express uncertainty about the initial steps to take.

Discussion Status

Some guidance has been provided regarding the use of centripetal force and gravitational force relationships. Multiple interpretations of the problem are being explored, particularly regarding the focus on the Sun versus the Earth.

Contextual Notes

The problem references a specific physics textbook, indicating a structured context for the discussion. There may be constraints based on the textbook's approach or assumptions about the system being analyzed.

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Homework Statement


The milky way galaxy ( which includes the Sun) rotates about its center with a period of 200 million years. The Sun is 2X10^20m from the center of the galaxy.

What is the net gravitational force on the sun due to the other stars in the milky way galaxy?

Homework Equations


F= m*a
F=Gm1m2/r^2
a=v^2/r

The Attempt at a Solution


I'm not even sure where to begin...
 
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You are given the period for the Earth's orbit around the galaxy. Can you convert that into a speed so you can use
F = m*a = m*v^2/r?
This is the centripetal force necessary to hold the Earth in its orbit, and we know that force is provided by the gravitational force so that will be your final answer.
 
Well this is about the Sun, I think I figured it out by finding the radial acceleration, and then plugging it into the F= m*a
 
Problem from College Physics text, 3rd Ed., Giambattista, Richardson, and Richardson?
 

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