109,606 reputation
5167295
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 9 months
seen 26 mins ago

Semi retired old time computer nerd who started programming on a Commodore Pet.

Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.


3h
comment Questions regarding entropy
As it stands your answer is too broad to be usefully answered here. The Wikipedia article on entropy explains the link to heat and other thermodynamic properties. The Wikipedia article on the second law of thermodynamics explains why entropy always increases. You need to rerad through these articles and come back to us if you have any more specific questions.
3h
comment Reference for coefficient of static friction can be larger than 1
This question appears to be off-topic because it is shows insufficient prior research
5h
comment How does path integral formulation explain bound states?
There are loads of articles in Googlespace on path integral treatment of the simple harmonic oscillator. This might be a good start.
5h
comment Can you pre-determine the result of a coin toss?
Related: Is it really impossible to calculate in advance the result of throwing dice?
5h
comment What were the metrics, shape and outlook of the universe from $t=0$ to year one?
See also this question, which goes through the calculations you describe.
5h
comment Can there be force without motion?
@Goodies: you're in luck. I have one of these special chairs available for sale at only $10,000 :-)
7h
comment Vertical motion initial velocity given max height
At the top of the trajectory the vertical component of velocity is zero, so $v = 0$. Your equation simplifies to $0 = (v_0\sin\theta)^2 + 2gh$. Note that $g$ is negative.
8h
comment Vertical motion initial velocity given max height
Use $v^2 = u^2 + 2as$. The velocity $v$ is $v_0\sin\theta$.
8h
comment Can there be force without motion?
As I type this there is a force of about 650N being applied to my buttocks by the chair I'm sitting on, but I'm not moving.
1d
comment Can the strings in string theory be thought of as troughs in a field?
I can't comment with any authority since I've only read introductory string theory stuff. However it is entirely unlike quantum field theory. It is one of the miracles of string theory that QFT emerges as a long range/low energy limit. So your question is basically meaningless. Sorry.
1d
comment Why are we not able to move at the speed of light again?
Your calculation is correct of course, but then you've assumed the equation $E = \gamma mc^2$ applies and the next question would be why does the energy become infinite?. I'm not sure this really addresses the why question.
1d
comment Can the strings in string theory be thought of as troughs in a field?
Your initial assumption is a long way wide of the mark.
2d
comment Nuclear fusion and the Sun
There is a related discussion here.
2d
comment Is a model of helium atom without electron-electron repulsion solvable analytically?
Even classically a three body problem has no analytical solution. While it's possible the quantum system would be simpler than the classical one it seems unlikely.
2d
comment My idea on parallel universes
You might also be interested to read about brane cosmology. Note that this idea is highly speculative with no experimental support for it.
2d
comment Should the answer to Einstein & Quantum gravity be found in conditions of our local observable universe?
I'm afraid the problems with quantum gravity are rather more fundamental then accounting for local inhomogeneities in average density.
2d
comment Newtonian gravity in 3D space, with 2 point masses, calculus, no approximations
Hi Jenny. We are (I think) a helpful open community, but we're a bit sensitive to people asking things they can easily find themselves. The two body problem is well described in the Wikipedia article and I don't see how we can improve on it here. For more than two bodies there is no analytic solution so you'd have to solve it numerically. The methods described in the Wikipedia articles apply to non-gravitationally bound systems like a comet in a hyperbolic orbit.
2d
comment What does negative absolute temperature mean?
Lots of related questions
Oct
27
comment Electrolysis of Paramagnetic Ferric Chloride in Water
Is it possible the line is due material being dissolved from the electrodes?
Oct
27
comment keyboard very strange behaviour
This question appears to be off-topic because it belongs on the Electrical Engineering SE