Greg Harrington
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 Apr1 awarded Popular Question Mar6 awarded Notable Question Sep24 awarded Autobiographer Jul13 awarded Famous Question Jul2 awarded Curious Jan24 awarded Popular Question Dec8 comment How to find the partial derivative of this function? Yes that is the reason. Thank you Dec8 comment How to find the partial derivative of this function? @pbs, the notation is saying the change in $\nu$ with $T$ while keeping $P$ constant. That is the notation my professor has given us and also how it is shown in the Thermodynamics book. I was just trying to be consistent Dec8 asked How to find the partial derivative of this function? Aug21 comment How to determine gradient of vector in cylindrical coordinates? @DoctorDan that resource is very helpful. I took multivariable calculus about 4 years ago and we are having a review in my graduate level fluid mechanics course and I am trying to remember all this stuff. Am I right in saying that the gradient of $\hat{V}$ in my original post is a vector and the divergence would be a scalar? Aug21 comment How to determine gradient of vector in cylindrical coordinates? I am working on a problem where I am trying to find the divergence of the vector in cylindrical coordinates but I need to find its gradient in order to do that. I have found the general form of the gradient online but I would like to understand how that was produced instead of copying it Aug21 comment How to determine gradient of vector in cylindrical coordinates? Yes that's what I meant. Sorry. The function I would be dealing with is still the one above Aug21 asked How to determine gradient of vector in cylindrical coordinates? Apr27 comment How do I find Laplace transform of $7t \cdot \mathrm{e}^{-3t}\cdot\sin(3t)$? This is perfect. Thank you very much Apr27 accepted How do I find Laplace transform of $7t \cdot \mathrm{e}^{-3t}\cdot\sin(3t)$? Apr27 asked How do I find Laplace transform of $7t \cdot \mathrm{e}^{-3t}\cdot\sin(3t)$? Mar12 awarded Commentator Mar12 comment What function satisfies these conditions? I was dealing with a PDE for the non-homogeneous wave (string) equation which I believe was $u_{t}-u_{xx}=e^{t}$ and the first step in dealing with this type of problem was to find a function, $v(x,t)$ that satisfied the boundary conditions and the initial condition which were given to me. God I feel like an idiot not being able to to determine the function so I did all the other steps without it but not having it is probably gonna hurt me. I wish you guys were there helpin me today! Mar11 comment What function satisfies these conditions? I just took a partial differential equations exam and I had to find a function $v(x,t)$ to satisfy these two boundary conditions: $$u(0,t)=0$$ $$u(a,t)=0$$ and this initial condition: $u(x,0)=0$. I was stuck on this for most of the test and could not figure out $v(x,t)$ so I did the whole problem without it. What is it, it was driving me crazy Mar11 comment What function satisfies these conditions? I was able to do the rest of the problem. That was the first step of many. Thanks a lot!