109,726 reputation
5167295
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 9 months
seen 2 hours 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.


1d
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.
1d
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?
1d
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.
1d
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 :-)
1d
reviewed Close Work done in isothermal process
1d
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.
1d
comment Vertical motion initial velocity given max height
Use $v^2 = u^2 + 2as$. The velocity $v$ is $v_0\sin\theta$.
1d
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
awarded  homework-and-exercises
1d
awarded  homework-and-exercises
2d
reviewed No Action Needed What is the effect of an increase in pressure on latent heat of vaporization?
2d
reviewed No Action Needed Need Quick reference card for scientific notation and symbols for paper reading
2d
reviewed Leave Open Why are we not able to move at the speed of light again?
2d
reviewed Leave Open For what kind of a profile will the average of the square be greater than the square of the average by a factor of 2?
2d
reviewed Leave Open How does a plunger (toilet plunger) work?
2d
reviewed Leave Open How much further can I throw a baseball (148 grams) than a grenade (453 grams)?
2d
reviewed Leave Closed Electric field at a point
2d
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.
2d
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.
2d
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.