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# Gravity.

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Two objects each with mass \(M_1\) and \(M_2\) is presented in the space, given the following statements:

1. \(M_1>M_2\)

2.Both objects have initial velocity \(v=0\)

3.The distance between the two objects \(= D\)

4.Assume that both of their mass is concentrated at each of their own center of gravity, and both object's size \(=0\)

5.Gravity decreases with the inverse square of distance to an object.

Answer the following questions:

1.Find the point between \(M_1\) and \(M_2\) where the gravity from both of them are the same (\(L_1\)).

2.Find the point where they hit each other.

3.Find the center of mass of the system.

Aug 22, 2017

### 4+0 Answers

#1
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Gravitational forces etc:   Aug 22, 2017
#2
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Your answer to the 2nd and the 3rd question is correct, good job! (You must have read a lot of books about classical physics didn't you.)

But for the 1st question, the question states that \(M_1>M_2\), that means their first Lagrangian point won't be midway between the two objects, but closer to \(M_2\), like how the point between the Sun and the Earth is closer to Earth than Sun does :D

Jeffes02  Aug 22, 2017
edited by Jeffes02  Aug 22, 2017
#3
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Actually, I gave answers for the first part for two cases; one when the two masses are not the same and one when they are (I could, of course, have left out the second possibility if I'd noticed that the question specified M1 > M2!)

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Alan  Aug 22, 2017
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Oh XD I didn't read your explanation correctly, thanks for the reply :D

Jeffes02  Aug 22, 2017