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 Dec 14 reviewed Approve How do I solve for $v_2$ where $mv_1^2 + MU_1^2 = mv_2^2 + M U_2^2$ and $MU_1 - Mv_1 = MU_2 - mv_2$ by eliminating $U_2$? Oct 15 awarded Yearling Feb 4 reviewed Approve Ternary dimensioned density matrix Jan 17 awarded Tenacious Jan 15 comment Is it possible to calculate the energy of a spark? Well then it should be easy enough to measure the energy if we know (can measure) the voltage and current as functions of time, since energy is given by $E=\int_0^t \! v(t)i(t) \, \mathrm{d}t$ Jan 15 comment Is it possible to calculate the energy of a spark? Do you mean a lighter with an 'electric ignition' type spark or the old-school 'flint-stone' types (eg: 'Zippo') ? Jan 11 answered Current in an RC Circuit Jan 11 awarded Good Answer Jan 10 comment Why do crystals grow in preferred directions? I thought the main question being asked is 'why the six-fold symmetry'? Although snowflakes generally exhibit this six-fold symmetry, most are not 'perfectly' symmetric, as explained here: its.caltech.edu/~atomic/snowcrystals/faqs/faqs.htm Jan 10 revised Why do crystals grow in preferred directions? added 519 characters in body Jan 10 comment Why do crystals grow in preferred directions? Apparently, the 'simplest' snowflake is a hexagonal prism. The dendrites grow from the rectangular faces around the edge more easily than the hexagonal faces, so they tend to grow as a 'flat' crystal rather than a spikey 'ball'. Have a look at this paper which explains it this way: its.caltech.edu/~atomic/publist/rpp5_4_R03.pdf Jan 10 answered Why do crystals grow in preferred directions? Jan 10 comment Magnetic Response of Stainless Steel check this: bssa.org.uk/faq.php?id=24 Jan 8 comment Why are gasses difficult to see? Not all gases are invisible. Chlorine gas is a pale yellow/green colour. Jan 8 revised Does the outflowing water create a thrust on the bucket? added 6 characters in body; deleted 1 character in body; edited body Jan 7 revised Is there a deterministic observable that has only single eigenvalue? deleted 5 characters in body; edited title Jan 7 comment Can Parallel Universes exist? By 'the Universe', do you mean 'the one ('uni') cosmos, world, reality, and nature' and everything contained within it ('versum', latin for 'having been turned into')? Jan 7 revised Do particles always flow from high to low pressure? added 105 characters in body Jan 7 answered Do particles always flow from high to low pressure? Jan 7 answered Where does this viscosity formula come from?