94,145 reputation
3125232
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 6 months
seen 1 hour 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.


22h
comment How does it seem to be that space/time always equals c?
@JoeBlow: I haven't read Andrew Thomas' third book but in his second book (about gravity) he comprehensively misunderstands the Big Bang, which doesn't bode well.
22h
reviewed Looks OK How does it seem to be that space/time always equals c?
22h
comment How would an X-ray scanner identify a mirror?
@JoeBlow: ah, yes. Weren't those the ones that could allegedly photograph you naked? With that sort of scanner the (hypothetical) X-ray mirror would appear to be glowing.
22h
answered How does it seem to be that space/time always equals c?
1d
reviewed Leave Closed If light was able to pass through a wall, would the wall be invisible to the human eye?
1d
reviewed Looks OK Electric field outside a capacitor
1d
reviewed Close Can Vacuum be non-causal ?
1d
reviewed Leave Open How much could one slow down aging using existing spacecraft?
1d
reviewed Close Is there a textile like material that can act as a spring?
1d
reviewed Leave Open Why Light and Observers have different laws of physics
1d
awarded  mass-energy
1d
awarded  observers
1d
comment Frame dragging — is there a “non-tiny” example?
@JoeBlow: if you're interested I've shared a Google spreadsheet with the frame dragging calculations in.
1d
comment Frame dragging — is there a “non-tiny” example?
@JoeBlow: re the bucket, if you put a stationary bucket inside a rotating spherical shell then the frame dragging will start to rotate the water in the bucket and make the surface curve. But your question says: if you have a bucket of water big enough, and spin it, it WILL NOT form the concave shape and that's what I don't understand.
1d
comment Frame dragging — is there a “non-tiny” example?
@JoeBlow: as it happens I did a quick calculation of the frame dragging at the surface of the Sun and also at the surface of Jupiter. Both are about 100 times greater than the Earth, though note this is still only 100 times a ridiculously small number. The average density of a galaxy is so low that any frame dragging effect is effectively zero. To get a significant frame dragging you want a high density i.e. a combination of high mass and small radius.
1d
reviewed Reviewed Why change in internal energy is zero in isothermal process
1d
reviewed Leave Open How does power consumption vary with the processor frequency in a typical computer?
1d
revised Frame dragging — is there a “non-tiny” example?
Correct typos
1d
reviewed Approve suggested edit on Polarizable molecule in E-field
1d
revised Do massless particles follow the curved spacetime or not?
added 26 characters in body