Recent content by dfx

Hi, I got hold of a set of kitchen weighing scales which are made of some ferromagnetic plate and my neodymium magnets. So the reading on the weighing scales increases as you bring the magnet near the weighing plate, as expected... they then reach a maximum just before you touch the magnets...

Hello, I was wondering, how exactly do magnetic fields interact? Say if you have 2 permanent magnets, 1 perhaps of 0.3T and another of 0.5T and you let the N and S attract so they clamp together, would the resulting field of the combination have 0.5T on both ends (i.e. would the surplus...

Thanks, all very helpful. I think I'll just postpone my plans for a few months and go back into use the school one for abit when I can. All of the ready made ones seem over $150, apart from the chipset. Might resort to the chipset and just hook it up to my multimeter. Btw I got a quotation...

Yes, that is correct. I may be addressed outisde the third person too. :) I've tried your suggestions and they brought some up, but they all seems really expensive (>$100) ! Back in school I had a really simple hall probe which you could hook up to USB and mess around with. Good times. Sigh.

Hey, Sorry this is probably in the wrong section but I couldn't think of a more appropriate one. Anyway, I've spent ages on the net looking for a really simple hall probe - like one which I used back in school measuring a max of upto 1.5 - 2 tesla, and I just cannot seem to find any school...

Bernoulli would be correct. Think about it, Bernoulli can be applied along a certain streamline. Consider a streamline from infinity...

...anyone?

No, this won't help. Even Wolfram gives an answer with Si(x) in it - the integral of Sinx/x.

Homework Statement Consider a linear system with the impulse response: g(t) = 3x^2 - 4x + 7 for t>0 and 0 otherwise. Find the output for the input f(t) = t for t \geq 0 and f(t) = 0 for t<0. Homework Equations \[ \int_{-\infty}^t f(t - \tau)g(\tau)\,d\tau\] The...

Ah right ofcourse. Cheers.

Are you sure? I had 2 lectures on shear stresses in beams and if there's one thing my lecturer kept emphasizing it was that shear stresses are NOT UNIFORM across the face of a beam. Simply dividing the shear force by the area with give the average shear stress - potentially disastrous. In fact...

Homework Statement An extract from my notes reads that "every boolean law has a dual: any valid statement is also valid with:" . replaced with + + replaced with . 0 replaced with 1 and vice versa. Homework Equations None The Attempt at a Solution I have no clue what this...

Read up on "pin-jointed analysis of trusses". The "matrix" is probably just Cramer's method to solve simultaneous equations for the member forces.

Yes you might get in through Extra, or you could take a gap year off and reapply. I've PMed you on other stuff. Well we do a lot of practical stuff - lots of drawing and projection theory (hate it with a passion) and then move on to CAD. We have lectures on product design/engineering...

Sure it's much easier to get into - you're almost pretty much guaranteed an offer with As at AS whilst even straight 100% at AS won't guarantee you Cam. I never dreamt I'd get in - with a 25% odd acceptance rate given all the high quality applicants no one takes getting in as a given - but since...