Recent content by arkofnoah

Wait hang on. If you multiply the components (a,b,c) by S, you will get (b, -a, c). i' = j, j' = -i, k'=k.

That's right. That's wrong. j'= -i, as stated in the question, so matrix S will transform the basis vector (0,1,0) to (-1,0,0).

Thanks for the reply. I got it now, and it's not a typo (and I don't think it was a typo in the first place, that's why I asked). In a matrix the basis vectors are written as columns, not rows. It's indeed very silly of me to read off the rows as the new basis vectors and arrived my previous...

Homework Statement https://dl.dropbox.com/u/4788304/Screen%20shot%202012-07-08%20at%2002.53.44.JPG This is the solution of Problem A.15 in Griffiths' Quantum Mechanics. Tx is the rotation matrix about x-axis for theta degrees; while Ty is the rotation matrix about y-axis for theta degrees...

*bump*

isn't fractional uncertainty (or fractional error if you choose to go by that name) a form of uncertainty? i don't get what's the issue here :confused: and what do you mean by the "first part"? but anyway the full solution is just this: total fractional uncertainty: 0.1/25 + 0.01/5 + 0.01/2 +...

?? I don't get you.

you should add up the fractional uncertainties not the absolute uncertainties.

Homework Statement http://img269.imageshack.us/img269/8792/screenshot20100816at003.png Uploaded with ImageShack.us Homework Equations The Attempt at a Solution The answer says that the loop will reduce in area to minimize the flux linkage, but why? using Fleming's left hand...

the speed of light is 3 x 10^8 m/s let the distance be x m, and then come out with a simultaneous equation.

he's telling you that ALL waves have alternating "crest" and "trough". by simple inference, longitudinal waves have "crest" and "trough" as well.

wow this is really elementary science. you're right for all.

http://img709.imageshack.us/img709/3114/screenshot20100811at030.png Just fill in the angles and do some trigo to get the value of the tension :smile: (You understand that when a system is in mechanical equilibrium, the vector sum of the forces is zero right?)

@borek: well we can always heat up the AgCl solution to increase solubility and add more reactive metals like zinc or magnesium powder (lol why copper of all metals?). but i agree that it's still not so feasible for AgCl because of the solubility constraints. but nevermind, this is off-topic :smile:

@Borek You can just displace the Ag+ out of the solution by throwing any metal above Ag in the reactivity series. You don't even need to go into electrolysis. Silver is one of the least reactive metals, beaten only by a handful like mercury, gold and platinum. (You do need to get AgCl to...