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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

I will try and answer questions on any topic. I will not answer homework problems.

Steve Johnson

On Vacation
returns 04/10/2017
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

2017-03-26 Finding voltage across a wire of unkown lengtg:

I don't help with homework problems.  It says so in my profile, right up front.  The answer is 16 volts.  Figure the current, figure the fraction of the voltage of these resistors in series, you get your

2017-03-26 Wine Glass Acoustics:

Perhaps you should elaborate as to which equation.  There are many equations involved in acoustics with many constants.  This one is probably a damping constant, but I have absolutely no idea without the

2017-03-21 Luminous intensity of Chandelier.:

Hello Prashant,    Yes, we can. I do not know if it is typically done. It would be (or perhaps is) difficult. The Chandelier would have to be surrounded with instrumentation. Enough sample measurements

2017-03-18 Equilibrium.:

Equilbrium is not a thing, it is a condition.  That's like asking what the SI units of "maximum" are.  Equilibrium what?  Forces in equilibrium?  Thermal equilibrium?  That makes no sense.    It is neither

2017-03-18 Equilibrium.:

Hello Prashant,    1. Equilibrium is a state, or condition. Therefore it would not have units. It is defined as a state in which the net force is zero and the net torque is zero.    2. Since it is not

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