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Jan
29
comment Could you use earth's magnetic field to build a hover skateboard?
"watts is a measurement of energy per time" Yes. "current is a measure of energy" No, it's a measure of charge per time.
Jan
19
comment How does the magnetic current in a MRI machine flow?
do you mean the electric current or the magnetic field?
Jan
19
comment Why are exploding HHO bubbles louder then pure HHO?
@ChrisWhite "There is no HHO molecule" Right. It's a "magnecule", held together by "magnecular bonds". :-/
Jan
15
comment Does gravity affect magnetism, vice-versa, or do they “ignore” each other?
@Cyberherbalist How current loops and solenoids curve space-time, A. Füzfa "We finally propose an experimental setup, achievable with current technology of superconducting coils, that produces a phase shift of light of the same order of magnitude than astrophysical signals in ground-based gravitational wave observatories."
Jan
15
comment Why does only one side of a neon lamp glow?
For the record, this is my highest-voted question, and I still don't know the answer. The answers given either contradict reality or are confusing me into thinking that they do.
Jan
15
comment Could synchrotron radiation be produced by a gravitational field instead of a magnetic field?
Similar question about Cherenkov radiation
Jan
15
comment Electro-gravitation - is it real?
Not as stated, no. Biefeld-Brown "lifters" are ionizing air and pushing it downwards like a helicopter. Has nothing to do with gravity and doesn't work in a vacuum.
Jan
15
comment Is it possible to create artificial gravity by magnetizing iron in the blood stream?
5. The iron in hemoglobin can't be magnetized in the first place.
Jan
15
comment Could you use earth's magnetic field to build a hover skateboard?
"requires a massive circulating current" ... "In fact the first pass analysis shows you need power on the order of 20kW" Current is measured in amps not watts. Why would you need to dissipate 20 kW? Superconducting currents don't dissipate any energy. Also superconductors hover in magnetic fields without any current flowing through them, no?
Jan
15
comment At an instant, does a system of gravitational charges exhibit equivalent behavior to a time-reversed system of like electric charges?
"There are no entropic effects in a two-body system" Don't they radiate gravitationally and get slowly closer together?
Jan
15
comment To What Extent are Magnetism and Gravity Related and Unrelated?
@JoeBlow Yes, there is a connection, electromagnetic fields create (very weak) gravitational fields: journals.aps.org/prd/abstract/10.1103/PhysRevD.93.024014
Jan
14
comment Do electromagnetic fields gravitate?
"the links in the comments cover this well" Please include all the links and content from the comments and then flag them for deletion so we don't need to waste time reading through and trying to figure out what's what
Jan
14
comment Is the Air Blue?
"Why is the Statue of Liberty green?" "Because it's made of copper." "Why is copper green?" "Because blah blah physics." ... "Why is the sky blue?" "Because it's made of air." "Why is air blue?" ...
Jan
5
revised What is electric energy since electrons are not consumed?
added 359 characters in body
Jan
5
answered What is electric energy since electrons are not consumed?
Jan
5
comment What is electric energy since electrons are not consumed?
"It won't work on DC"? Resistive heating elements definitely work on DC.
Jan
5
comment Rings of light around a jet
I thought you meant this en.wikipedia.org/wiki/Shock_diamond :D
Jan
4
comment Loudspeaker frequency response dip
Looks like cancellation from reflection?
Nov
30
revised Do gravitational waves slow down as they pass through matter?
added 87 characters in body
Nov
14
awarded  Popular Question