Recent content by Robine

Slightly tangential to the question is the following from MKaku on this website: "..At present, the most promising (and only) candidate for a “theory of everything”, including quantum gravity, is superstring theory or M-theory. It is the only theory in which quantum forces may be combined with...

If this is T x T = kd + A/d with k,A constants and T, d variables it's a non linear equation, NOT a straight line.

Calabi-Yau spaces (as suggested above) is a good place to visualize some space shape candidates. Currently the dimensions envisioned may be on the order of Planck length, billions and billions of times smaller than subatomic particles, far too small to be detected at present. So small,in fact...

When Einstein was working his way through special and later general relativity, many of his contemporaries thought he was on the wrong track. He wondered himself at times. The fact that String Theory is neither proven nor disproven today doesn't mean its wrong. Many past theories were considered...

Or were you asking about space dilation, that is the expansion of space itself between us and very distant parts of the universe?? A rapidly moving distant point appears as chroot describes, but if the distance is so great as to involve expansion of space itself then time not only appears...

Your approach is of course "magical" because it is not currently believed anything can go faster than light. But when some way is found to circumvent that all ideas about FTL will come under new scrutiny.

My take is that you can make some simplifying assumptions...pick an area for the size of the magnification spot, maybe 1/32" diam...make the paper black, then it won't reflect much. Used the specific heat of wood. Paper doesn't conduct well, so 99% of the heat from the focused light will stay...

Photon absorption and release from electrons would be interesting even if it were instantaneous...and it may be. How does a "particle" with mass, energy and momentum absorb or release a "particle" that has energy but no mass nor momentum? I guess string theory provides the latest hypothetical...

robine did not say that light is at rest, I said a photon has no rest mass to distinguish it from possible relativistic mass that might be inferred. KREB provided a far more complete description in his reference "here". (above) We should note that basically no one knows precisely what light...

Back to the original question. Light has no rest mass, hence no weight. Light has both wave and a particle character. As as wave it's hard to imagine any rest mass, and as a photon phenomena rest mass also appears to be zero. E=hf=pc is the only quantification I am aware of, but I'm an amateur...

Well if you get the details worked out I'd be interested to look at them here. It IS a very interesting problem. I haven't studied heat for close to forty years, so this is especially challenging. Reflectivity and heat dissipation appear to be relevant, but so does specific heat. I think...

We usually think of (gravitational) potential energy at the Earth's surface to be zero. If we raise an object we consider it to have gained potential energy because we did work against the force of gravity. But dig a hole on the beach and move the object into it and it's now at negative...

If you assume water and ice are both incompressible, pressure will not decrease the volume of either. In general, extra pressure means extra heat (like putting air in a tire) so you might argue that the temperature of the mix will increase and that would cause some ice to melt. You could also...

negative gravity means repulsion as posted above. But conventional matter does not exhibit repulsive gravity. It is represented in general relativity byu the cosmological constant. Einstein showed that gravity is based on mass, energy and pressure. Negative pressure means begative (repulsive)...

will an ice cube float in alcohol The principle here is which is denser. Think about a similar question: does wood float in water? Does oil float in water? In all these cases the less dense material will float on the more dense. Because the weight per unit volume is greater in one than the...