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Dr. Stephen O. Nelson

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

Palash Apte

On Vacation
returns 12/31/2016
I will try and answer questions on any topic. I will not answer homework problems.

Steve Johnson

On Vacation
returns 12/10/2016
I would be delighted to help with questions up through the first year of college Physics. Particularly Electricity, Electronics and Newtonian Mechanics (motion, acceleration etc.). I decline questions on relativity and Atomic Physics. I also could discuss the Space Shuttle and space flight in general.

Recent Answers

2016-11-25 Heat Engine Question:

Well, heat builds pressure.  Pressure acting against a surface applies a force.  That force, on a piston, travels a distance.  That force*distance = a work.  So a constant inflow of heat applies an increasing

2016-11-21 Tipcat experiment:

Hello Tess and Madelaine,    Yes there are forces in this scenario. Of course there is the force that is applied to the stick that makes it fly. And there is the stick's weight. Both of those act downwards

2016-11-19 Egg Drop Project: toothpicks and elmers glue:

Hello Heather,    There have been many questions on allexperts about egg drop projects. The Search feature at top right on this page would -previously- work well to generate a list of them. That would

2016-11-19 Physics:

I'll start at the first step.  Assuming it was let in from a very large reservoir of compressed air, I guess?  Otherwise, assuming it maintains 20 PSI the whole time is a grossly incorrect assumption.

2016-11-19 Refractive Index:

Indexes of refraction have two parts.  The part you learn about in simple optics, and the complex bit that pertains to absorption.  As a word, "platinum" is not capitalized, by the way.  In the case of

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