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seen Jul 14 at 18:43

I've got a BS in Physics from the University of Rochester, and I'm over half-way through my masters in optical engineering. I work at the Laboratory for Laser Energetics, where I develop and maintain technology for the Omega EP laser.

http://en.wikipedia.org/wiki/Laboratory_for_Laser_Energetics


Jul
14
comment Turbine like device in space spinning with KE and converting to Watts. Acceleration is constant?
Do you understand that any mechanism you use to draw energy from the turbine will produce a force slowing the turbine down? If you're not drawing energy from the turbine, but you are providing energy input then yes, it will accelerate forever.
Jun
24
comment Accelerometer problem - difficulty understanding my readout
The accelerometer rotates with the wheel, right?
May
30
awarded  Nice Answer
May
1
reviewed Approve suggested edit on How hot does the upstairs need to be before it will heat the basement through convection?
Apr
19
comment Fraunhofer Diffraction using lenses
I find it odd that you're in a situation where somebody is asking you about Fraunhofer diffraction when your total knowledge of lenses is that they "magnify images". Are you taking a class that you haven't taken prerequisites for?
Mar
20
comment How can KVL & KCL be derived from Maxwell equations?
You can't, because it isn't.
Mar
18
comment How can KVL & KCL be derived from Maxwell equations?
For a rough estimate of the scale of the problem, you could take the speed of light divided by the length scale of your apparatus. That will give you a frequency scale for the problem. Frequencies significantly smaller than that scale can be approximated as static fields.
Mar
18
comment How can KVL & KCL be derived from Maxwell equations?
Maybe you aren't familiar with the practice in the physical sciences of making approximations. A law that holds under some conditions will (often) hold approximately when those conditions are only approximately satisfied. What qualifies as a sufficiently close approximation depends on the scale of the system in question. For electromagnetic devices of reasonable size, "slowly varying" can mean quite rapid variation.
Mar
16
comment How can KVL & KCL be derived from Maxwell equations?
Yes, as Ali said.
Mar
15
comment How can KVL & KCL be derived from Maxwell equations?
Approximately, yes.
Mar
12
comment How can KVL & KCL be derived from Maxwell equations?
Small numbers are approximately zero.
Mar
9
comment How can KVL & KCL be derived from Maxwell equations?
@rza : That's why she specified "in the absence of a time varying magnetic field".
Jan
3
comment Why doesn't an electron feel an electric field, and thus accelerate whilst inside the drift tube of a linear accelerator?
It is most definitely not fine to approximate a moment in time as static. If that were always the case we would not even need electrodynamics! That approximation can only be made when the fields are changing sufficiently slowly that dynamic effects are insignificant. Accelerators operate at Radio frequency, so a static approximation isn't reasonable.
Dec
26
comment Is it possible to focus the sun in such way?
Lenses do not increase power. Also, if that first mirror is particularly reflective, it will reflect the same from both sides. You cannot create a mirror that's only reflective from one direction.
Dec
16
awarded  Yearling
Oct
18
comment Arduino Servo Torque Calculation for a Automated Telescope
No, it would not. I think you might be confused about something. A counterweight would result in the load remaining stationary in any position unless an external force were applied. That way large servos are not required. All the servo needs to overcome is bearing friction and the inertia of the telescope.
Oct
18
comment Arduino Servo Torque Calculation for a Automated Telescope
Right, which is very unbalanced. The typical way to solve this problem is a counterweight, as Martin suggested.
Oct
8
comment Why is it difficult to differentiate between interference and diffraction?
I'd consider your description to be of one of the common effects of diffraction of an optical field around an edge. The resulting fringe pattern is called "diffraction" by many. However, in optics we would say that any optical field propagates via diffraction, even in the absence of any obstruction. For example, if I shine a laser at the moon and I want to calculate how wide the beam would be when it gets there, I'd calculate the optical field at the moon due to diffraction propagation, using a Fraunhofer diffraction integral.
Oct
8
answered Why is it difficult to differentiate between interference and diffraction?
Sep
11
comment formula for transparency of very thin film of metal
Related to this, which I answered a couple years ago: physics.stackexchange.com/questions/1094/…