Post Your Amusements!

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Re: Post Your Amusements!

Postby Klaudandus » Thu Sep 18, 2014 2:23 pm

I can see banning those doxxing, but general banning is... bleh... not that I go to /v/... only thread worth checking is /co/ =P
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Re: Post Your Amusements!

Postby Skye1013 » Fri Sep 19, 2014 1:41 pm

Klaudandus wrote:http://www.rawstory.com/rs/2014/09/bible-pushing-christians-open-the-door-for-satanic-activity-books-in-florida-schools/

I'm actually really glad they're doing this... most of the highly vocal Christians that are pushing through these religious laws/court judgments really don't understand what kinds of a doors they're truly opening...
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Re: Post Your Amusements!

Postby bldavis » Fri Sep 19, 2014 2:56 pm

this is what i said should happen all along...
you want YOUR religion in public schools, it needs to be open to all
and it is happening :D
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Re: Post Your Amusements!

Postby Nooska » Fri Sep 19, 2014 11:47 pm

Started levlling another holy cow as prot... in Eitrigg... US... Haven't picked up mists or WoD yet US side - and just preordered and payed for boxed CE for EU.....
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Re: Post Your Amusements!

Postby Klaudandus » Tue Sep 23, 2014 3:54 pm

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Re: Post Your Amusements!

Postby bldavis » Wed Sep 24, 2014 1:32 pm

i realized how big of a nerd i was when i found my self fascinated watching a playlist of just videos about the elements in order of period number
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Brekkie:Tanks are like shitty DPS. And healers are like REALLY distracted DPS
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Levie:(in /g) It's weird, I have a collar and I dont know where I got it from, Worgen are kinky!
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Re: Post Your Amusements!

Postby Amirya » Tue Oct 07, 2014 3:13 pm

Intro to Astronomy (AST 111) wrote:Consider a civilization broadcasting a signal with a power of 1.4×104 watts. The Arecibo radio telescope, which is about 300 meters in diameter, could detect this signal if it is coming from as far away as 118 light-years. Suppose instead that the signal is being broadcast from the other side of the Milky Way Galaxy, about 70000 light-years away. How large a radio telescope would we need to detect this signal? (Hint: Use the inverse square law for light.)


Me, after the second wrong answer wrote:( Milky Way Light Years / Arecibo given distance ) x Arecibo size (300meters) = Your answer


Screw the inverse square law. It made no sense whatsoever.
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Re: Post Your Amusements!

Postby theckhd » Wed Oct 08, 2014 5:40 am

Er.... wat?

edit: meaning, the answer should simply be (new_distance/old_distance)^2*aricebo_area
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Re: Post Your Amusements!

Postby Amirya » Wed Oct 08, 2014 9:17 am

I have a unique brain. In order to explain it to my classmates, I wrote a huge long paragraph instead of a formula (formula is courtesy one of the classmates).

I have no idea why we were supposed to use the inverse square law, though. It's in chapter 15 of our textbooks, but we jump from 13 to 24...

assuming, of course, you mean, "what the fuck sort of english is that, Amirya?"
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Re: Post Your Amusements!

Postby theckhd » Fri Oct 10, 2014 10:37 am

Well, you use the inverse square law because it tells you the radiated power per unit area from a point source. To detect the signal, the detector (aricebo's dish in this case) needs to measure a certain level of power. The power it measures is its area times the power per unit area hitting it (i.e., from inverse square law).

Example:
Code: Select all
d = 300m         //aricebo diameter
A = pi*(d/2)^2   // aricebo area

P = 1.4e104      // radiated power from source
R1 = 118         // distance from source to detector, in light years

I1 = P / (4*pi*R1^2)  // Intensity at detector
p1 = I1 * A           // Power collected by detector


Ok, now you want to change the distance between the source and detector from R1=118 to R2=70000 light years. That causes the intensity to drop off to
Code: Select all
I2 = P / (4*pi*R2^2)


Which means if we use Aricebo again, we only collect
Code: Select all
p2 = I2 * A = A * P / (4*pi*R2)^2


Which is MUCH less than p1 because R2 is MUCH bigger than R1 was, and we're dividing by R^2. The wording of the problem indicates that we need to collect at least p1 worth of power to be able to detect the source ("could detect this signal if it is coming from as far away as 118 light-years").

So, back to the drawing board - we need a bigger detector, so we can collect more power. How much bigger? Well, let's go through this again, but this time with a detector of area A3 that's larger than A. We'll also stipulate that the power we collect (p3) has to be equal to p1, since we know that's enough power to actually detect the signal.

Math happens:
Code: Select all
p1 = I1 * A
p3 = I2 * A3

p1 = p3

I1 * A = I2 * A3


Now we substitute our values in for I1 and I2:
Code: Select all
A * P / (4*pi*R1^2) = A3 * P / (4*pi*R2^2)


The P/(4*pi) cancels, leaving us with:
Code: Select all
A/R1^2 = A3/R2^2

And we simply solve that for A3:
Code: Select all
A3 = (R2/R1)^2 * A

Since Area = pi*r^2 = pi/4*d^2, we'd take the square root of this to figure out the change in diameter, which gives you your original formula:
Code: Select all
d3 = (R2/R1)*d


In other words, the area of the new detector needs to be (70000/118)^2=351910.371 times bigger than Aricebo. But since area goes as the square of radius (or diameter), that only needs to be 70000/118=593 times as large.

The wording of the problem ("how large a radio telescope") is sort of ambiguous. I assumed it was looking for the area, because that's a more interesting quantity here. You were calculating the diameter. Both are acceptable, I guess - they both describe the new telescopes "size" accurately enough, just in different ways. I probably would have asked for the area if I had written the problem, since it would force the student to think about the inverse square law.
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Re: Post Your Amusements!

Postby Era » Fri Oct 10, 2014 10:55 am

theckhd wrote:Well, you use the inverse square law because it tells you the radiated power per unit area from a point source. To detect the signal, the detector (aricebo's dish in this case) needs to measure a certain level of power. The power it measures is its area times the power per unit area hitting it (i.e., from inverse square law).

Example:
Code: Select all
d = 300m         //aricebo diameter
A = pi*(d/2)^2   // aricebo area

P = 1.4e104      // radiated power from source
R1 = 118         // distance from source to detector, in light years

I1 = P / (4*pi*R1^2)  // Intensity at detector
p1 = I1 * A           // Power collected by detector


Ok, now you want to change the distance between the source and detector from R1=118 to R2=70000 light years. That causes the intensity to drop off to
Code: Select all
I2 = P / (4*pi*R2^2)


Which means if we use Aricebo again, we only collect
Code: Select all
p2 = I2 * A = A * P / (4*pi*R2)^2


Which is MUCH less than p1 because R2 is MUCH bigger than R1 was, and we're dividing by R^2. The wording of the problem indicates that we need to collect at least p1 worth of power to be able to detect the source ("could detect this signal if it is coming from as far away as 118 light-years").

So, back to the drawing board - we need a bigger detector, so we can collect more power. How much bigger? Well, let's go through this again, but this time with a detector of area A3 that's larger than A. We'll also stipulate that the power we collect (p3) has to be equal to p1, since we know that's enough power to actually detect the signal.

Math happens:
Code: Select all
p1 = I1 * A
p3 = I2 * A3

p1 = p3

I1 * A = I2 * A3


Now we substitute our values in for I1 and I2:
Code: Select all
A * P / (4*pi*R1^2) = A3 * P / (4*pi*R2^2)


The P/(4*pi) cancels, leaving us with:
Code: Select all
A/R1^2 = A3/R2^2

And we simply solve that for A3:
Code: Select all
A3 = (R2/R1)^2 * A

Since Area = pi*r^2 = pi/4*d^2, we'd take the square root of this to figure out the change in diameter, which gives you your original formula:
Code: Select all
d3 = (R2/R1)*d


In other words, the area of the new detector needs to be (70000/118)^2=351910.371 times bigger than Aricebo. But since area goes as the square of radius (or diameter), that only needs to be 70000/118=593 times as large.

The wording of the problem ("how large a radio telescope") is sort of ambiguous. I assumed it was looking for the area, because that's a more interesting quantity here. You were calculating the diameter. Both are acceptable, I guess - they both describe the new telescopes "size" accurately enough, just in different ways. I probably would have asked for the area if I had written the problem, since it would force the student to think about the inverse square law.


Most amusing post in amusement thread, imo.
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Re: Post Your Amusements!

Postby Amirya » Fri Oct 10, 2014 12:02 pm

And that is the most explanatory and comprehensive post I've ever found about inverse square law. I really appreciate it, Theck :) Thank you.
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Re: Post Your Amusements!

Postby Nooska » Sat Oct 11, 2014 12:45 am

Fringe benefits of having a physics ph.d. on board ;)

And yes, this amuses me :)
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Re: Post Your Amusements!

Postby Era » Sat Oct 11, 2014 3:26 am

Nooska wrote:Fringe benefits of having a physics ph.d. on board ;)

And yes, this amuses me :)


Yeah, my sentiments exactly. "Oh look, what a funny cat gif! Also, here's this long post about physics!"
Probably helps that I actually enjoy that stuff. If I could do a third degree, it'd probably be in physics. Or architecture. Or maybe criminology. I'm a difficult child, okay?
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Re: Post Your Amusements!

Postby Klaudandus » Sat Oct 11, 2014 7:01 am

Wholeheartedly agree
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Re: Post Your Amusements!

Postby Sagara » Sat Oct 11, 2014 9:46 am

Era wrote:
Nooska wrote:Fringe benefits of having a physics ph.d. on board ;)

And yes, this amuses me :)


Yeah, my sentiments exactly. "Oh look, what a funny cat gif! Also, here's this long post about physics!"
Probably helps that I actually enjoy that stuff. If I could do a third degree, it'd probably be in physics. Or architecture. Or maybe criminology. I'm a difficult child, okay?


Well, if you're anything like me, it's just that LEARNING is fun. Doesn't really matter what it is so long as it tingles the curious bone.
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Re: Post Your Amusements!

Postby Era » Sat Oct 11, 2014 11:27 am

Sagara wrote:Well, if you're anything like me, it's just that LEARNING is fun. Doesn't really matter what it is so long as it tingles the curious bone.


Yeah. If it wasn't for the practical need for additional money (more than for just living, like paying back student loans etc) and just a little dash of materialism (I have expensive tastes okay), I'd just aim to be a student my entire life. Learning as much as possible about as many things as possible.
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Re: Post Your Amusements!

Postby Nooska » Sat Oct 11, 2014 11:44 am

You never stop learning;
As long as you are learning you are living (and inverse, if you aren't learning then you are already dead)

Era should know this proverb as its an old nordic one (which has been rewritten for present day; original " We learn as long as we live")
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Re: Post Your Amusements!

Postby Arnock » Sat Oct 11, 2014 2:46 pm

Internet went down this afternoon, so on a whim I decided to try USB tethering from my phone.

I have 0 bars of LTE reception inside my apartment, but my download speeds tripled.

Yay only having access to DSL!
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Re: Post Your Amusements!

Postby Amirya » Tue Oct 14, 2014 7:17 pm

Doing the Iron Horde stuff on my paladin, all she gets is gold from the quests.

Do them on my warrior. She gets a ring. Then the quest "Lunatic Lieutenants," offers a 515 necklace that requires the character to be level 100 to equip. LOL
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Re: Post Your Amusements!

Postby Era » Tue Oct 14, 2014 7:45 pm

I too want to playyyy. :( Even though I'm currently in Japan, my WoW account still resides on the EU servers, so still some hours to go for me.
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Re: Post Your Amusements!

Postby Amirya » Wed Oct 15, 2014 12:26 pm

My paladin managed to get tier pants and gloves off the Celestials pre-patch. Now that the patch hit, it amuses me to see "Heroic" on those two pieces of her gear.
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Re: Post Your Amusements!

Postby Arnock » Thu Oct 16, 2014 3:22 pm

Apple's new iMac has a 5k resolution, and it has a mobile GPU.

This ought to be... interesting.
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Re: Post Your Amusements!

Postby Koatanga » Thu Oct 16, 2014 8:13 pm

Arnock wrote:Apple's new iMac has a 5k resolution, and it has a mobile GPU.

This ought to be... interesting.

The resolution is going to surpass that of the human retina. Maybe Apple can re-invent the eye so all those pixels could be useful. They could call it the iBall.

Actually it's not that bad, since it's a 27" monitor. Only 220 pixels per inch. My Kindle beats that at 339 ppi.
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Re: Post Your Amusements!

Postby Ironshield » Fri Oct 17, 2014 3:01 am

Era wrote:
Sagara wrote:Well, if you're anything like me, it's just that LEARNING is fun. Doesn't really matter what it is so long as it tingles the curious bone.


Yeah. If it wasn't for the practical need for additional money (more than for just living, like paying back student loans etc) and just a little dash of materialism (I have expensive tastes okay), I'd just aim to be a student my entire life. Learning as much as possible about as many things as possible.

Might I suggest:
https://coursera.org/
There are quite a few other MOOCs out there as well, but I've used Coursera so I can confidently recommend it. There is a wide range of courses available as well.
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