- #1

- 430

- 2

If we write out the position vector in the vector notation and differentiate twice we get

**a**=-p

^{2}

**r**and this clearly is directed towards the centre of the axes system and not the focus.Any ideas?

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- Thread starter aim1732
- Start date

- #1

- 430

- 2

If we write out the position vector in the vector notation and differentiate twice we get

- #2

- 15,415

- 687

Correct.If we write out the position vector in the vector notation and differentiate twice we geta=-p^{2}rand this clearly is directed towards the centre of the axes system and not the focus.

Ideas regarding what? I assume you are trying to prove Kepler's first law. The given equation does not describe a planet's motion. You need to find the right equation.Any ideas?

- #3

- 430

- 2

have to prove that it's acceleration vector passes through the focus of the conic----ellipse in this case as can be clearly seen.

I meant this.

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