Luke

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68 reputation
3
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location London
age 23
visits member for 3 months
seen 2 days ago
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student


19 Actions

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2d
 accepted Vector cross product of $\mathbf{r}$ and $\ddot{\mathbf{r}}$ in polar coordinates
May
17
 comment Vector cross product of $\mathbf{r}$ and $\ddot{\mathbf{r}}$ in polar coordinates
Is it going to be something like $-G\frac{\left(M+m\right)}{r^{3}}\left(\mathbf{r}\times\mathbf{r}\right)=0$?
May
17
 asked Vector cross product of $\mathbf{r}$ and $\ddot{\mathbf{r}}$ in polar coordinates
May
7
 accepted What's the physical difference between the quantities $\langle v_{i}v_{j}\rangle$ and $\langle v_{i}\rangle\langle v_{j}\rangle$?
May
4
 asked What's the physical difference between the quantities $\langle v_{i}v_{j}\rangle$ and $\langle v_{i}\rangle\langle v_{j}\rangle$?
Apr
25
 answered What is the process that gives mass to free relativitic particles?
Apr
25
 accepted Missing step while (classically) deriving Friedmann equation
Apr
25
 comment Missing step while (classically) deriving Friedmann equation
ok I see... the product rule ;p I tried to do it LHS->RHS, what I should do is just the product rule on the RHS, silly me...
Apr
25
 asked Missing step while (classically) deriving Friedmann equation
Apr
16
 accepted Can dark matter be relativistic dust?
Apr
16
 asked Can dark matter be relativistic dust?
Feb
16
 awarded  Supporter
Feb
16
 accepted Relation between multipole moment and angular scale of CMB
Feb
16
 comment Relation between multipole moment and angular scale of CMB
@ChrisWhite I believe this is what I am looking for. So how do I relate $l$ to $\theta$ using spherical harmonics?
Feb
16
 asked Relation between multipole moment and angular scale of CMB
Feb
13
 awarded  Scholar
Feb
13
 awarded  Student
Feb
13
 accepted What happens if an atom absorbs a photon of energy higher than first excited state but lower than second excited state?
Feb
13
 asked What happens if an atom absorbs a photon of energy higher than first excited state but lower than second excited state?