Recent content by Ferrus

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    Early earth - silicates

    Excellent thank you. What is mechanism of their reaction? I have seen the mechanisms for oxides on water with both acidic and basic characters, electrostatics, etc... how without the polar molecules of water are they able to mediate a reaction? Is it just a matter of gibbs free energy...
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    Early earth - silicates

    How did the silicates form during the period in which a gas of silica coalesced into a ball of molten silicon? I thought silicate typically only forms in basic aqueous solutions, which clearly did not exist at this period.
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    Element 113 & 115

    Planckium, Feynmanium, Darwinium, Newtonium, Lavoisium or Diracium seem likely candidates for names if you ask me.
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    Electron spin entanglements - time-energy uncertainty

    So I have been thinking through this. I am an amateur so bear with me but... Two opposite spin electrons will have a hamiltonian given by p^2/2m + mu(S1.S2) Or some equivalent constant in from of that. Clearly there are two energy states referring to opposite and same spin, in fact, the...
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    Electron spin entanglements - time-energy uncertainty

    I've been watching Susskind's lectures on quantum mechanics and he mentions that the time taken for two electrons to entangle their spin is a function of their distance, which in itself determines the energy that is released when two electrons fall into a singlet state. Does anyone here know how...
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    Japan Earthquake: nuclear plants

    Can someone answer a basic chemistry question here: what is the redox potentials of the zirconium-water reaction? Is it thermodynamically infeasible under standard conditions, or does the oxide coating merely form a high activation energy barrier ala TST?
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    Why is there a universal speed limit, c, and why is it what it is? 'One story has it that Grothendieck is now convinced that the Devil is working to falsify the speed of light. Schneps ascribes his concerns with the speed of light to his anxiety about the methodological compromises...
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    Magnetic pressure and bar magnets

    So it has been puzzling me that the repulsion and attraction between two bar magnetics can be considered as a consequence of magnetic field energy density - that is magnetic pressure. I realise 1/2B^2/mu_0 is the pressure and that times the area gives the force. But conceptually I don't...
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    Chadwick's experiment and proton velocity

    How did he measue the proton velocity in the polonium-beryllium experiment? The only source with some description describes his using current as a means to do so - but sure that would require knowledge of the number of protons in order to ascertain the drift velocity?
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    Statistics - related pdfs

    Homework Statement I am given the lens maker's equation: 1/u + 1/v = 1/f Then told that U and V are random variables based on this equation. U is uniformly distributed between 2f and 3f. The question is to prove the pdf of V is f/(v-f)^2 and find the cdf for V. Also - find the...
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    Algebra 2 Finding Zeros. HELP!

    With number 5 - how do you do synthetic division with an imaginary number?
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    Complex cube root of 1

    Homework Statement If w is a complex cube root of 1, prove that x + wy + w^2z is a factor of x^3+ y^3 + z^3 - 3xyz, and hence factorise the equation completely. Homework Equations Complex cube root of 1 = -1/2 +/- 3^1/2/2 i The Attempt at a Solution Erm, I feel way over my head...