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

Thanks greg

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

Do you have the workings?

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

thanks

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

What you wrote clarified my problem. tks

Are the negative powers of the Laurent expansion only as big as the largest pole?

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?

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

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.

number of electrons per unit volume

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

Homework Statement In attachment The Attempt at a Solution I'm stuck.

I worked it out thanks

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

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

Thanks

For classical molecular dynamics what does the classical bit refer to? What is non-classical molecular dynamics?

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. ?

Question is in attachment The Attempt at a Solution i) < 5 | 3 > ii) G < 3 | 3 > iii) (Lz)/2 < 5 | 5 >

What does the ratio c/a mean in solid state physics? I have attached a table with a an example. Cheers

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

I have attached it as a jpeg, the reactions are below in the pic not on the right

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?

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

So if the derivative = 0, then it is still differentiable?

Say f(x)=x^5 and g(x)=ln(x) but f(x) is not 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

How do I enter Latex into the Messages?

When it says "about a point x=a", what does this mean? why not just say at x = a? Thanks

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...

Hi Please can someone explain in a simple way what the Diffraction plane & image plane are Thanks

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

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

How do they interact then in this case?

But how does the KE rise if it is assumed that atoms are spheres which interact elastically?

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?

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?

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

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

thanks

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...

why is the temperature distribution of hot gases inside galaxies evidence for dark matter and why is Type 1a Supernovae evidence for dark energy

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

what is the best way to solve it computationally?