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Old 02-22-2014, 01:32 PM   #9761
cheesefries
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If the moon was made of spare ribs... would you eat it?
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Old 02-22-2014, 02:33 PM   #9762
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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?

Think about it.
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Old 03-05-2014, 02:30 PM   #9763
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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.
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Old 03-05-2014, 03:16 PM   #9764
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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.
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Old 03-05-2014, 03:19 PM   #9765
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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?
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Old 03-05-2014, 03:24 PM   #9766
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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
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Old 03-05-2014, 03:29 PM   #9767
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Thanks guys
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Old 03-18-2014, 08:41 PM   #9768
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What is making a guitar pickup picking up hum? And why is the hum getting worse on a gain channel?
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Old 03-18-2014, 08:46 PM   #9769
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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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Old 03-19-2014, 01:54 AM   #9770
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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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Old 03-19-2014, 04:07 AM   #9771
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Quote:
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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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Old 03-23-2014, 10:25 AM   #9772
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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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Old 03-23-2014, 03:06 PM   #9773
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Because {v1,v2} is a basis of V.
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Old 03-26-2014, 01:04 PM   #9774
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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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Old 03-26-2014, 01:11 PM   #9775
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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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Old 03-26-2014, 02:23 PM   #9776
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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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Old 03-26-2014, 10:02 PM   #9777
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two vectors u and v are parallel if u=k*v, for any constant k
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Old 03-28-2014, 02:29 PM   #9778
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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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Old 03-30-2014, 02:13 PM   #9779
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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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Old 03-30-2014, 02:38 PM   #9780
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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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