# Nick Kidman

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Actress with an interest in the philosophy of science.

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 Nov28 comment Azimuthal quantum number,l and magnetic quantum number,m are from angular momentum? Outrageous use of commata. Nov27 comment Gradient of a two-component field It's not straight forward notation, but my guess is that $\nabla\phi$ sound be interpretet as the vector with six components, $\tfrac{\partial}{\partial x^1}\phi_1, \tfrac{\partial}{\partial x^2}\phi_1, \dots, \tfrac{\partial}{\partial x^3}\phi_2$ and then $(\vec{\nabla}\phi)^T(\vec{\nabla}\phi):=\sum_{i\in\{1,2,3\}}\sum_{j\in\{1,2\}}(‌​\tfrac{\partial}{\partial x^i}\phi_j)^2$ Nov21 comment Difference between B and H in magnetic fields? (you can write \vec{J}_\text{free} there, or \vec{J}_\mathrm{free}) Nov20 comment Free path distribution Generally, if you have two physical quantities $a,b$ of some dimensions, the products $a^nb^m$ are standard candidates for characteristical dimensions. In your case for concentration $\sim m^{-3}$ and cross section $\sim m^2$, you find $c^n \sigma^m$ to have dimension $\text{length}^{-3m+2n}$. If $-3m+2n=1$, that product is of dimension length. The mean free path will be that times some geometric factor. This doesn't solve you problem of course, but it's a helpful way for analysis of physical systems. Nov12 comment Can I express the heat flow of a fluid in terms of estabilshed characteristics of the velocity distribution? @SimpleLikeAnEgg: Given as an expectation value like above, and in comparison with the other quantities, which has such an interpretation, why wouldn't it be a property of the statistical distibution. It's just third order in $\bf v$. Nov9 revised Can I express the heat flow of a fluid in terms of estabilshed characteristics of the velocity distribution? deleted 5 characters in body Nov9 revised Can I express the heat flow of a fluid in terms of estabilshed characteristics of the velocity distribution? deleted 5 characters in body Nov9 asked Can I express the heat flow of a fluid in terms of estabilshed characteristics of the velocity distribution? Nov9 comment Motivation for tensor product in Physics @WetSavannaAnimalakaRodVance: Yeah I know that. I guess you were joking, as it doesn't relate to scientology at all, or is taking any stance on it. Nov9 comment Motivation for tensor product in Physics @WetSavannaAnimalakaRodVance: Scientology?? I think you're not taking me serious. Nov9 revised In what way do passive circuit elements change the functional form of the voltage? deleted 6 characters in body; edited title Nov8 comment Derive this thermodynamic relation What's the point of your \bigg's? Nov8 revised Which model of computation can be viewed as being extended by the currently most relevant models of quantum computation? added 1 characters in body Nov7 revised In what way do passive circuit elements change the functional form of the voltage? added 175 characters in body Nov7 revised In what way do passive circuit elements change the functional form of the voltage? added 175 characters in body Nov7 revised In what way do passive circuit elements change the functional form of the voltage? added 175 characters in body Nov7 revised In what way do passive circuit elements change the functional form of the voltage? added 34 characters in body Nov7 revised In what way do passive circuit elements change the functional form of the voltage? added 152 characters in body Nov7 asked In what way do passive circuit elements change the functional form of the voltage? Nov7 comment Motivation for tensor product in Physics I think these kinds of questions are difficult to answer. The creator of the physical examples didn't have universal properties in mind when they made their definitions. Once the structures are geometric enough to even admit a metric (and hence bring with it this and that hom sets with composition, which leaves this and that feature invariant), it's reasonable that forming tensor products becomes possible.