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1. Calculating total price using kilo watt hours?

What is the cost for 1 hr? Current = 1 A Voltage = 25 000 V Kilowatt hour = £0.10 KWhr

Thanks greg
3. Simultaneous equations

I would put my working but I am slow in writing latex and my exam is tomorrow, thanks for the help anyway
4. Simultaneous equations

Do you have the workings?
5. Simultaneous equations

Homework Statement Question is in the attachment, this is for revision not homework

thanks
7. Solving Gamma Function Homework: Get Help Now

Homework Statement In attachment The Attempt at a Solution I can't see the link in the steps, a little help pls.
8. Laurent series expansion

What you wrote clarified my problem. tks
9. Laurent series expansion

Are the negative powers of the Laurent expansion only as big as the largest pole?
10. Calculating Copper Cu Charge Density

To convert atomic mass to kg, I do 63.5 x 1.66^10-27 = 1.0541 x 10^-25kg Then 8920 kgm^-3 / 1.0541 x 10^-25kg = 8.462195238 x10^28m^-3 but it should be around 10^9 says wikepedia?
11. Laurent series expansion

Thanks for your help. With the expansion that you made, how does this differ to the taylor expansion? or it the same?
12. Laurent series expansion

Homework Statement In attachment The Attempt at a Solution I break into partial fractions, then get stuck. Please help me in layman terms f(z) = -1/3[3(z+1)] + 4/3[z+4] Now I am stuck.
13. Calculating Copper Cu Charge Density

number of electrons per unit volume
14. Calculating Copper Cu Charge Density

How do I work out the charge density of Copper Cu, if atomic mass =63.5 Density = 8920 kgm^-3 Assume 1 electron per cu atom.

yep sure is
16. Current Density: Homework Statement & Stuck Solution

Homework Statement In attachment The Attempt at a Solution I'm stuck.
17. Plotting X & Y Values in Xmgrace

I worked it out thanks
18. Plotting X & Y Values in Xmgrace

Hi I have an open-office spreadsheet with x values and y values, I would like to plot in xmgrace. How do I do this? Thanks
19. CPMD ( Car-Parrinello Molecular Dynamics)

What is a wave function optimisation? What is a plane wave cut-off? Thanks

Thanks
21. Molecular dynamics

For classical molecular dynamics what does the classical bit refer to? What is non-classical molecular dynamics?
22. Function space in Quantum

Homework Statement In attachment "question.jpeg" i. I can do ii. I need some help iii. I need some help The Attempt at a Solution i. \int_{-1}^{1} \Psi_{1} \Psi_{2} dx = 0 ii. ? iii. ?
23. Bra-ket notation physics help

Question is in attachment The Attempt at a Solution i) < 5 | 3 > ii) G < 3 | 3 > iii) (Lz)/2 < 5 | 5 >
24. What does the ratio c/a mean in solid state phyiscs

What does the ratio c/a mean in solid state physics? I have attached a table with a an example. Cheers
25. What is a first order process in particle physics

For example the first reaction wrote that due to non conservation of electron lepton number, this reaction cannot procceed? Thank you, I have to go
26. What is a first order process in particle physics

I have attached it as a jpeg, the reactions are below in the pic not on the right
27. What is a first order process in particle physics

Thanks for you response I am new to the subject so excuse my ignorance. So the violation of laws that they are referring to are conservation of lepton no, baryon no, Charge (which are first order?). Where as weak and strong are second order?
28. What is a first order process in particle physics

I was given the following question Which of the reactions on the right are allowed by first-order processes? For those which are not allowed, state one conservation law which is violated. What is a first order process in particle physics? i.e what does first order refer to? What would be...

Thanks
30. How to prove if f(x) is infinitely differentiable

So if the derivative = 0, then it is still differentiable?
31. How to prove if f(x) is infinitely differentiable

Say f(x)=x^5 and g(x)=ln(x) but f(x) is not infinitely differentiable ?
32. How to prove if f(x) is infinitely differentiable

Say I have the function f(x) = x^5ln(x) I can differentiate f(x) say 6 times and I'm left with just ln(x). But this is not a proof! How do I go about proving it? Could I use the Taylor expansion?

Thanks
34. LaTeX How do I enter Latex into the Messages

How do I enter Latex into the Messages?
35. Taylor series question

When it says "about a point x=a", what does this mean? why not just say at x = a? Thanks
36. Gerchberg–Saxton algorithm

Please help me understand the Gerchberg–Saxton algorithm what I comprehended so far 1) A source is shone on an object and produces a diffraction pattern in the diffraction plane. We do not know the dimensions of the object. 2) We are unable to calculate the phase of the of the wave, due...
37. Diffraction plane & image plane

Hi Please can someone explain in a simple way what the Diffraction plane & image plane are Thanks
38. Turned my Laptop hard-drive for windows into a external hard drive,

What are these ways? Because when I try to acess my files under my login name, windows says access denied. It is not set as a bootable
39. Turned my Laptop hard-drive for windows into a external hard drive,

I can't exess files from my specfic login only the public files e.g. files that were on my desktop. Any ideas? Cheers
40. Where does heat come from?

How do they interact then in this case?
41. Where does heat come from?

But how does the KE rise if it is assumed that atoms are spheres which interact elastically?
42. Where does heat come from?

Correct, it was a mistake however can be rationalized, with the fact that there is heat "caused by" the compression and extension of the spring. But the point is was, where does the temperature rise come from? Is your ans that the average KE is increased of the spring particles?
43. Where does heat come from?

For example If I extend and compress a spring numerous times the spring will increase in temperature. Where does the rise in temperature come from? The atoms that "make up" the spring from an atomistic point where does this rise in temperature come from?
44. Identifying Forces in Reaction Equations

For example P + P -> P + P This is just one example. but is there a set of rules that can be followed to come to the correct outcome each time
45. Identifying Forces in Reaction Equations

How can you determine if a reaction occurs by the electromagnetic, strong or weak force by looking at the reaction equation

thanks
47. Dark matter collisions with Xe on earth

original question Assume that the density of dark matter near the Earth is 0.3 GeV / cm3 and that the dark matter particle has a mass of 100 GeV and a velocity of 200 km/s. If the dark matter-nucleon cross section is 10^-44cm2 calculate how many events you would expect to see every year in a...
48. Unveiling Dark Matter and Dark Energy: Exploring Galaxies and Supernovae

why is the temperature distribution of hot gases inside galaxies evidence for dark matter and why is Type 1a Supernovae evidence for dark energy
49. In C how would i write an array to a file

In C how would i create, open and write an array to a text file The array is EeV[i], does it make a difference if I am using ubuntu or windows
50. What are the normalizations constants of psi(x) in a finite potential box?

what is the best way to solve it computationally?