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 02-22-2014, 01:32 PM #9761 cheesefries High Five!     Join Date: Feb 2014 If the moon was made of spare ribs... would you eat it? __________________ Gibson & Fenders Marshall DSL50, TSL60, Mesa Dual Rec Orange 4x12 & 2x12 Line 6 G50 Wireless & a bunch o' pedals
02-22-2014, 02:33 PM   #9762
DamienEx1021
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Join Date: Apr 2013
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Quote:
 Originally Posted by cheesefries If the moon was made of spare ribs... would you eat it?

Its against my religion to eat 'space rib'. You see, this 'space rib' provides us with our tides and assists in stabilizing our orbit to the solar center. If everyone said "well just one bite wouldn't hurt" then the next thing you know half the moon is gone and our solar balance is forever changed.

Now don't get me wrong, I would love to try it, but do you think you would want to stop eating 'space rib' once you had it?

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 03-05-2014, 02:30 PM #9763 Ablast Registered User   Join Date: Apr 2011 anyone wanna help me with this problem? how many photons are produced in a laser pulse of 0.686J at 487nm? I have worked it out 2 times but it says I am wrong.
 03-05-2014, 03:16 PM #9764 DamienEx1021 Registered User     Join Date: Apr 2013 Location: Virginia E=hv c=wv rearrange to v=c/w E=(hc)/w E = energy of a single photon h = reduced Planck constant c = speed of light constant w = wavelength v = frequency Convert nm to m E = (2.998x10^8 m/s * 6.626x10^-34 J*s ) / 4.87x10^-7 m E = 4.079x10^-19 J/photon 0.686 J * (1 photon / 4.079x10-19 J ) = 1.682x10^18 photons Check your units, conversion, sig figs, and make sure you aren't dropping off decimals till the very end. __________________ “The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
 03-05-2014, 03:19 PM #9765 jocke_x1 Registered User     Join Date: May 2006 I would guess you could use E_photon = h*nu -> E_tot = n*E_photon -> n = E_tot/E_photon Just be carful about units, Plancks constant ~6.6 Js nu = c/487nm -> n= 1.682*10e18 photons is that what you got?
03-05-2014, 03:24 PM   #9766
Ablast
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Join Date: Apr 2011
Quote:
 Originally Posted by DamienEx1021 E=hv c=wv rearrange to v=c/w E=(hc)/w E = energy of a single photon h = reduced Planck constant c = speed of light constant w = wavelength v = frequency Convert nm to m E = (2.998x10^8 m/s * 6.626x10^-34 J*s ) / 4.87x10^-7 m E = 4.079x10^-19 J/photon 0.686 J * (1 photon / 4.079x10-19 J ) = 1.682x10^18 photons Check your units, conversion, sig figs, and make sure you aren't dropping off decimals till the very end.

I got a very similar answer to both of you, my calculator apparently thought it was 1.682x10^19 photons

 03-05-2014, 03:29 PM #9767 Ablast Registered User   Join Date: Apr 2011 Thanks guys
03-18-2014, 08:41 PM   #9768
liampje

Join Date: Jun 2009
What is making a guitar pickup picking up hum? And why is the hum getting worse on a gain channel?
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03-18-2014, 08:46 PM   #9769
Neo Evil11
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Quote:
 Originally Posted by liampje What is making a guitar pickup picking up hum? And why is the hum getting worse on a gain channel?

Magic.

Or it is caused by external electro magnetically generated fields. The pickup is basically acting like an antenna and “receiving” the signals generated by this electrical field.
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03-19-2014, 01:54 AM   #9770
liampje

Join Date: Jun 2009
Quote:
 Originally Posted by Neo Evil11 Magic. Or it is caused by external electro magnetically generated fields. The pickup is basically acting like an antenna and “receiving” the signals generated by this electrical field.

Yeah, I know about that a change in magnetical flux induces a current. But WHAT is it that changes the magnetical flux?
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03-19-2014, 04:07 AM   #9771
FrenchyFungus
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Quote:
 Originally Posted by liampje Yeah, I know about that a change in magnetical flux induces a current. But WHAT is it that changes the magnetical flux?

http://en.wikipedia.org/wiki/Mains_hum
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03-23-2014, 10:25 AM   #9772
laid-to-waste
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question i'm stuck on:

let V be the set of real numbers in 2 dimensions. (R^2)
let v(1) = (1,1) and v(2) = (-1,1)

say why there is a unique linear transformation x:V->V with x(v(1)) = v(1) and x(v(2)) = v(1) + v(2)
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03-23-2014, 03:06 PM   #9773
damian_91
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Because {v1,v2} is a basis of V.
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03-26-2014, 01:04 PM   #9774
laid-to-waste
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cheers man, i have a new question if that's alright. i'm revising calculus and i still don't know how to do this properly:

http://i.imgur.com/T9c7Xl9.png

this is my attempt at the first part:

http://i.imgur.com/YZLhQlM.jpg

for the different amoeba positions, do i just change the x and ys in the grad(fi) equations to (x-2) etc? help would be appreciated. also, if you could tell me if i did it wrong that would be nice too. thanks
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 Originally Posted by skylerjames13 you've got the sickest abs i've ever seen and it's enough to turn me gay
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 Originally Posted by MetalMullet you look pretty curved mate!

complement my abs or physique or general attractiveness for your chance to be quoted right here

03-26-2014, 01:11 PM   #9775
damian_91
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Join Date: Apr 2009
Location: Argentina
you're supposed to evaluate grad(phi) at (0,0) and show the result is a constant times (1,2), meaning they're parallel, then calculate grad(phi) at each given point.
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03-26-2014, 02:23 PM   #9776
laid-to-waste
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thanks man, huge help! just one question, why does a constant times the vector (1,2) mean it's parallel?
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 Originally Posted by vintage x metal I just looked at your pics; you're very cute

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 Originally Posted by skylerjames13 you've got the sickest abs i've ever seen and it's enough to turn me gay
Quote:
 Originally Posted by MetalMullet you look pretty curved mate!

complement my abs or physique or general attractiveness for your chance to be quoted right here

03-26-2014, 10:02 PM   #9777
damian_91
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Join Date: Apr 2009
Location: Argentina
two vectors u and v are parallel if u=k*v, for any constant k
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03-28-2014, 02:29 PM   #9778
Ninja Vampirate
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Quote:
 Originally Posted by laid-to-waste thanks man, huge help! just one question, why does a constant times the vector (1,2) mean it's parallel?

If you have a vector in a direction and you multiply it by a number, it continues in the same direction, just with a larger magnitude. If you have a chess board and you move up 1 square and right 2 squares, this is essentially the same as moving 2 squares up and 4 squares right or whatever. If you like to picture arrow vectors, it will point in the same direction but it will just be longer.
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03-30-2014, 02:13 PM   #9779
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Quote:
 Originally Posted by Ninja Vampirate If you have a vector in a direction and you multiply it by a number, it continues in the same direction, just with a larger magnitude. If you have a chess board and you move up 1 square and right 2 squares, this is essentially the same as moving 2 squares up and 4 squares right or whatever. If you like to picture arrow vectors, it will point in the same direction but it will just be longer.

cheers man, i just had difficulty imagining it, that makes a lot of sense now. sorry for the late reply, i came back here to actually ask another question and then saw your reply.

if a mass in free-fall from a point of rest experiences a force F = i + k due to a strong
wind, how do i determine the path of the mass? any help would be appreciated, the lecture notes aren't helping me at all after 2 hours of looking through.
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Quote:
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03-30-2014, 02:38 PM   #9780
sickman411
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Join Date: Jan 2009
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I have no idea whether this is actually what it's supposed to be, but I think you could take the integral of adt where a is the acceleration and get the velocity and then take the integral of vdt to get the distance travelled, for each one of the directions.

You end up with parametric equations describing the path of the object, and then you can eliminate the t variable and get an equation which describes the path of the object.
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