# Recent content by Hendrick

1. ### How to determine force using a measured current

I don't think I can show you a diagram, but I can try to explain it better: I am applying force to a lorentz force motor which has a displacement transducer in it which produces a change in current when the height of the motor increases and decreases (you put your foot onto the plate of the...
2. ### How to determine force using a measured current

Hi, I'm trying to calibrate a voltage divider circuit to measure force. I have measured the current output at two different weights, converted the weights to forces using "f=mg" and calulated a gradient from that using "y = mx + c" as well as the constant. However, I don't feel what I did...
3. ### Applying Bernoulli's equation to magnetohydrodynamic flow

1. Homework Statement A static electrically conducting fluid, in the presence of electric and magnetic fields, experiences a Lorentz force. Determine the fluid pressure at point (1,2,1) when the pressure LaTeX Code: p_{0} at origin (0,0,0) is under the effect of gravity and the electric and...
4. ### Applying Bernoulli's equation to magnetohydrodynamic flow

Homework Statement A static electrically conducting fluid, in the presence of electric and magnetic fields, experiences a Lorentz force. Determine the fluid pressure at point (1,2,1) when the pressure p_{0} at origin (0,0,0) is under the effect of gravity and the electric and magnetic field...
5. ### Proving tensor symmetry under transformation

Did I not write my question properly or does no one know?
6. ### Proving tensor symmetry under transformation

Homework Statement Using indical notation, prove that a 2nd order symmetric tensor D remains symmetric when transformed into any other coordinate system. Homework Equations Tensor law of transformation (2nd order): D'_{pq} = a_{pr}a_{qs}D_{rs} The Attempt at a Solution I think I'm...

Anyone?
8. ### Proof of transformational symmetry

Homework Statement Using indical notation, prove that D retains it's symmetry when transformed into any other coordinate system, i.e. D'_{pq} = D'_{qp} (where D is a symmetric 2nd order tensor) Homework Equations D'_{pq} = a_{pr}a_{qs}D_{rs} (law of transformation for 2nd order tensors)...
9. ### Kronecker Delta

Homework Statement Simplify/Evaluate these expressions involving the Kronecker delta, using Einstein's summation convention: a)\delta_{qr}\delta_{rp}\delta_{pq} b)\delta_{pp}\delta_{qr}\delta_{rq} Homework Equations \delta_{ij}=0 when i =/= j \delta_{ij}=1 when i = j The Attempt at...
10. ### Orthogonality of Sine and Cosine functions

Hi, would anyone be able to explain how to evaluate a function using orthogonality (i.e. using orthogonality to solve a definite integration problem with sines/cosines)? Thank you
11. ### Partial Differential Equation using separation of variables

Homework Statement Solve the heat flow problem using the method of separation of variables: Homework Equations PDE:\frac{\partial u}{\partial t}=k\frac{\partial^{2} u}{\partial t^{2}} for 0<x<L, 0<t<\infty BC's:\frac{\partial u}{\partial x}(0,t)=0,\frac{\partial u}{\partial x}(L,t)=0...
12. ### Partial Differential Equations Question

Hi Cyosis, I did make a mistake while equating. Thank you :)
13. ### Partial Differential Equations Question

Hi, do you mean try solving \frac{\partial^{2} u}{\partial x^{2}}=2\frac{\partial u}{\partial t} without substituting u, first? Thanks
14. ### Partial Differential Equations Question

Homework Statement Find the link between constants \omega and \beta so that http://www4e.wolframalpha.com/Calculate/MSP/MSP181963g2e5f4i43d3b00005ief8e24920ah323?MSPStoreType=image/gif&s=20 [Broken] is a solution of \frac{\partial^{2} u}{\partial x^{2}}=2\frac{\partial u}{\partial t} (A...
15. ### The path of crossing a stream

Hi, was the hypotenuse correct? Because if I did it via Pythagoras, it yields an equation which I do not think is equal. \sqrt{(W-x)^{2}+y^{2}}