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 Aug 2 comment Slowing down light in an opaque crystal for a whole minute i'm not an expert i have no idea. take my answer with skepticism Jul 14 comment Apart from Alfvenic turbulence, what is the most important unsolved problems in plasma physics? Jul 13 comment Photons, no energy? $E=mc^2$ is only for things which don't have velocity. $E^2=m^2c^4+p^2c^2$ is correct. But when the velocity is $0$ ($v=0$) then the momentum is $0$ ($p=mv=0$) so you get the equation $E=mc^2$. Jul 10 comment Understanding Charles's Law @SamamaFahim Just make sure that the external pressure is constant. Usually, the 'outside' pressure is (approximately) constant, so you can just 'expose it to the outside'. Jul 3 comment Planck length implies lattice structure of space? "There is currently no known physical significance of the Planck length; it is, however, a topic of research."-Wikipedia Jun 24 comment When a moving body collides with a stationary body, far from its centre, how do you calculate the resulting spin you should learn about conservation of angular momentum Jun 22 comment How can time be relative? " time passes for everyone in the same manner (you can't feel a change)" only if you're not moving relative to yourself. Imagine a rotating man, with the axis of rotation passing through the centre of the rod. The edges of the man will age slower than the centre. If you wave your hand in the air, your hand ages slower than you. However, at everyday-life speeds (speeds much smaller than the speed of light) this difference in aging is tiny and insignificant. Jun 17 comment Why do whips hurt so much? paint not proportional to energy. Jun 14 comment Group theory notation used in physics (AdS/CFT) slac.stanford.edu/econf/C0906083/pdf/10.pdf May 26 comment Quantum mechanics and everyday nature Fire and stars have different colors at different temperatures. This is explained by the quantum mechanical explanation of blackbody radiation. May 22 comment How long would it take for a container in vacuum to leak half of its air? geoffreylandis.com/higgins.html May 16 comment Does inertia increase with speed? I didn't consider special relativity in my answer. May 5 comment Air pressure relative to a force on a bag? @RobB I edited my answer to add that information. See physics.stackexchange.com/posts/63304/revisions for side-by-side comparison of the edit. Mar 31 comment What determines bubble locations in boiling water? Just a comment, this seems abstractly related to formation of structures in the universe, which is caused by lack of symmetry. So if the water, pressure, heat transfer etc. had perfect symmetry, the entire water should just become a bubble at the same time. Mar 28 comment Why a day is divided by 12/24 hours? Why the number 12? @DavidHammett you should cite sources Mar 28 comment How long can you survive 1 million degrees? Another similar phenomena occurs in out own atmosphere! "The highly diluted gas in this layer can reach 2,500 °C (4,530 °F) during the day. Even though the temperature is so high, one would not feel warm in the thermosphere, because it is so near vacuum that there is not enough contact with the few atoms of gas to transfer much heat."-en.wikipedia.org/wiki/Thermosphere Mar 28 comment How long can you survive 1 million degrees? depends on your conductivity, heat capacity and resilience of your body Mar 12 comment What is the minimum optical power detectable by human eye? math.ucr.edu/home/baez/physics/Quantum/see_a_photon.html Mar 12 comment How do I minimize the the stress created by fore-aft forces? Please provide a drawing or picture of your project Mar 6 comment Quantum computers: are they possible or impossible? "May 20, 2011, D-Wave Systems is marketing a \$10,000,000 Quantum Computer named "D-Wave One" with a 128-qubit (quantum bit) chipset that performs just a single taskâdiscrete optimization." en.wikipedia.org/wiki/…