Timeline for Showing The Laplace–Runge–Lenz vector (per unit mass) is constant

10 events

when toggle format	what		by	license	comment
Oct 25, 2017 at 12:25	comment	added	sammy gerbil		See Show that the Laplace-Runge-Lenz vector is conserved using poisson brackets
Jun 17, 2017 at 10:17	comment	added	Theorem		Alright I got it thanks! and is there no way in which you don't use $\theta$-vectors? Seems like an overkill...
Jun 17, 2017 at 8:33	comment	added	David Hammen		@Theorem - Use that to calculate $\vec H$ and then $\hat r \times \vec H$. Everything will cancel.
Jun 17, 2017 at 7:28	comment	added	Theorem		@David $\dot{\hat{r}}=\dot{\theta}\hat{\theta}$ so $\dot{\vec{r}}=\dot{r}\hat{r}+r\dot{\theta}\hat{\theta}$ but what does that give me?
Jun 17, 2017 at 7:28	comment	added	Theorem		@Qmechanic the maths there is over the top for me and it doesn't revole around the one per unit mass.
Jun 16, 2017 at 19:30	comment	added	Qmechanic♦		Related: physics.stackexchange.com/q/18088/2451 and links therein.
Jun 16, 2017 at 19:29	history	edited	Qmechanic♦		edited tags
Jun 16, 2017 at 19:15	history	edited	David Hammen		edited tags
Jun 16, 2017 at 19:14	comment	added	David Hammen		This looks like homework, so just a hint: Start with $\vec r = r \hat r$. What is it's time derivative? To answer that, you'll need to answer the auxiliary question, what is the time derivative of $\hat r$?
Jun 16, 2017 at 18:54	history	asked	Theorem	CC BY-SA 3.0