15,162 reputation
33563
bio website
location Princeton, NJ
age 24
visits member for 1 year, 9 months
seen 7 hours ago

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


8h
comment how does a helicopter get forward thrust?
This is misleading. The deflection angle does not directly push air horizontally. It creates a lift imbalance, torquing the entire assembly (with a ~90 degree phase lag as per the cross product). Horizontal thrust is the result of the plane of the blades not being horizontal.
1d
reviewed Close Stable equilibrium
1d
reviewed Close about the gravitation chapter
1d
reviewed Close Does dark energy bring both universe curvature and expansion?
1d
comment How do I get around the fact that boundary conditions don't apply in the equation's region of validity?
You can use the equation at the boundary of the domain of validity. This can be made perfectly rigorous mathematically (which I'm hoping someone will write up more fully) using any one of a number of tools.
1d
reviewed Leave Open How do I get around the fact that boundary conditions don't apply in the equation's region of validity?
1d
comment Using increase in pressure from melting of ice to produce energy?
why hasn't anyone tried it? - Why would anyone try it? Are you thinking this could be a free source of energy? Is there some particular setting where melting ice and piezoelectric materials are in abundance but batteries are not?
1d
reviewed Close Why do we see laser beams?
1d
reviewed Close consequences of universe in which second law of thermodynamics does not hold
1d
reviewed Close Generate unit cell from space group
1d
reviewed Close How does the angle and mass affect the efficiency of a cart moving up a ramp?
2d
comment What precisely does the 2nd law of thermo state, considering that entropy depends on how we define macrostate?
Excellent question. And welcome to Physics Stackexchange!
Apr
15
comment Why does my eardrum feel strange inside a car?
Any answers here can only be wild guesses, because there isn't enough information to go on. Did this only happen while the car was moving? How fast? What was the terrain? The weather? Were you driving through a tornado? Did you sneeze particularly hard? Did the feeling go away upon swallowing? Were any windows open?
Apr
14
comment Wouldn't angular momentum of a binary star system decrease?
The OP seems to have had a different question in mind than the one originally asked, but +1 for the answer to what was originally written.
Apr
12
comment How is the Plane of the Solar System oriented to the Sun's motion through space?
@JohnRennie Well there is at least one other obvious interpretation, as has partially been answered already: physics.stackexchange.com/questions/2582/the-galactic-plane
Apr
8
comment Where can I find the list of the planetary motion equations?
Hi there, and welcome to Physics Stackexchange! Just so you know, we implement Latex-style math formatting on this site. (Detailed guide here)
Apr
8
revised Where can I find the list of the planetary motion equations?
added tex; added tag
Apr
7
reviewed Leave Open Is there an analogue of a geodesic for the evolution of the electromagnetic field?
Apr
7
reviewed Leave Open What is the physical interpretation of the dot/inner/scalar product of two vectors?
Apr
7
reviewed Leave Open Do Pulsar Stars produce sound?