The reason i joined PF 5 years ago was with a similar question i had after finding this site http://www.besslerwheel.com/
This site concerns a perpetual motion machine.
But after talking to the people on PF i now realize that there can be...
Hi. Does the light from a lensed object take longer to reach us, than the light from an unlensed object at the same distance.
I mean because the light from a lensed object has a curved path.
Does a gravitational lense have a focal point, like a nomal lense but as a focal point sphere/horizon. if so is there a formula that relates the mass of the GL with the radius of its focal horizon. Happy xmas.
Looks to me like a band of water that is separating the still ice from the rotating ice.
What gets me though, is, has this area of water any properties that differ from the normal (ice, water, steam) solid, liquid, gas?
I mean, why is the band so wide if its only friction that's wearing...
After some very strong winds last night here, in the U.K. There is an oily type residue which is visible on external glass surfaces ie windscreens. This effect has happened over a 25 mile radius as i know off. Could this be any thing to with hurricane tomas, lifting oil from the surface in the...
In the attached a diagram there are 2 stars on the left, the upper star is the apparent position as veiwed from Earth and the lower star the true position. The central star is the Sun
Could anyone give or direct me to an equation for the angle by which the light is deflected aº in...
This only happens when the atom has an energy level that matches the energy level of the photon. If the energylevel does not match the photon energy, it does not go back to the light. The energy instead goes toward increasing the motion of the atoms, which causes the material to heat up
Most colours seen in ordinary experience are caused by the partial absorption of white light. The pigments that give colour to most objects absorb certain wavelengths of white light(adding to the internal energyof the object) and reflect or transmit others, producing the colour sensation of the...
A hydrogen atom is consists of a proton (uud quarks) and an electron.
Is there a heavier atom of hydrogen that consists of a type of proton (ccs or ttb quarks) and a muon or tauon respectively?
Hi all, just looking on google Mars and have found an unusual crater, it seems to me that a meteorite has landed in another meteorites crator.
Has this really happened or is there some other way this effect could be created?
The coordinates of the crater on google Mars are, 19°53'15.38"N...
You could take the temperature of the steak, then take it to the top of your chimney and dropit and retake the temperature Then work out the hieght needed for it to cook to your liking, taking into account things like decreasing air resistance, type of marinade etc
While just standing on creaking floorboard, i was thinking about where the energy came from to create the noise.
I assume it came from me moving my mass over the creaky point, therefore do i lose more energy walking on creaky floorboards than just normal floorboards?
Did anti gravity exist at the beginning of the universe when the conditions were hot/high energy, which repulsed matter at a rate proportional to the square of the distance (inflation maybe) until, the universe had expanded and cooled enough for this force (anti gravity) to return to normal...
thx for reply Bob, where does the energy come from for synchrotron radiation... is there a change in mass of the charged particle, or is the amount of energy needed for S.R. equal to the magnetic energy/force applied to the particle.
Thanks for the link, it looks like good read. i just started reading the introduction and on page 3 Humphries states that " magnetic forces cannot affect a particles kinetic energy".
Do the photons of synchrotron radiation not carry away/convert the kinetic energy of the particle?
The above quote is from another thread about a month ago, so i started another thread.
As above...red light about 600 nanometers, blue light about 400 nanometers, so what could the smallest possible wavelength of light be or is it infinely small?
or the longest possible wavelength for that matter
Thank you for all your replies, its just that it seemed a lot redder than usual that night and i was watching for a few hours its been overcast since so not had a chance to see it recenctly, thanks again all.