15,082 reputation
33563
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location Princeton, NJ
age 24
visits member for 1 year, 8 months
seen 4 hours ago

I am a graduate student studying astrophysics at Princeton. I received my bachelor's in physics and mathematics from Caltech (2011).


Mar
11
comment What makes some laser beams visible and other laser beams invisible?
I use green for pointing out stars in the sky; violet does indeed appear too dim, and blue lasers are expensive enough that I haven't tried.
Mar
10
reviewed Leave Open Applied / environmental question: direction of exhaust fumes
Mar
10
reviewed Leave Open Why is second moment of area often referred as moment of inertia?
Mar
10
reviewed Close Quarks are now considered to be fundamentals, but so were atoms some time ago. So the way we see is only limited by our technological advances?
Mar
10
reviewed Leave Open What makes an abstract physical system describable by a “fluid” equations of motion?
Mar
10
reviewed Close Numerical: Work Power Energy
Mar
10
reviewed Close How can you use magnets to rotate a shaft, which in turn powers a generator?
Mar
10
reviewed Leave Open Cart on Ramp with Varying Acceleration
Mar
10
comment How does isotropy of free space imply $L(v^2)$ for a free particle?
I don't have the book on me, but does he need to exclude this case? As in, any function of $v^2$ is equally a function of $|\mathbf{v}|$ and vice versa. In other words, are you implying that he really needs to show $L \propto v^2$ (modulo a constant) for some future result?
Mar
9
reviewed Approve suggested edit on
Mar
9
reviewed Approve suggested edit on
Mar
9
reviewed Approve suggested edit on Tensor decomposition under $\mathrm{SU(3)}$
Mar
9
comment How was this dot identified as a mystery planet originally (Pluto in this case)?
@PeterMortensen Assuming circular, coplanar orbits, then I think measuring just the position of the planet and the rate of change of that angle (i.e. using just two images) gives you enough information to find its distance. But eccentricity adds another parameter, so you need more observations. Of course, most of Pluto's motion on sky is actually due to us moving, so in the limit that it can be taken to be still, you can again approximate its distance with just two measurements.
Mar
9
revised How was this dot identified as a mystery planet originally (Pluto in this case)?
added more information
Mar
9
answered How was this dot identified as a mystery planet originally (Pluto in this case)?
Mar
9
revised How was this dot identified as a mystery planet originally (Pluto in this case)?
edited tags
Mar
8
comment Zeno’s Paradox of the Arrow
That depends on your definition of "in motion." The sensible definition says velocity is nonzero if and only if the object is in motion. Zeno's definition of "in motion" isn't defined for a single instant.
Mar
8
revised Why don't black holes form from forces other than gravity?
edited tags
Mar
8
answered Zeno’s Paradox of the Arrow
Mar
8
reviewed Leave Open Zeno’s Paradox of the Arrow