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Long and Thin or Short and Thick?

Blogs > EsX_Raptor
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EsX_Raptor
Profile Blog Joined February 2008
United States2802 Posts
Last Edited: 2011-07-13 18:10:20
July 13 2011 17:06 GMT
#1
Problem

Suppose we have two connected syringes A and B of cylindrical shape:

[image loading]


Syringe A is given to a little girl and syringe B is given to a guy.

Assume both syringes can hold the same volume V, the uncompressible liquid between them is also V, and the radius of syringe B is equal to twice the radius of syringe A.

Question 1

If the little girl presses her syringe with a force of F, how strong does the guy have to press his syringe to stop her?

Question 2

Repeat problem 1 assuming the liquid is air at STP.

Question 3

In question 2, how much does the air compress?

+ Show Spoiler [answers] +
Solution 1

FB = 4 * FA

Where FB is the force applied by the guy and FA is the force applied by the little girl.


***
danmooj1
Profile Blog Joined November 2004
United States1855 Posts
July 13 2011 17:09 GMT
#2
thought this was gonna be about something else
#1 XellOs fan!
Serejai
Profile Blog Joined September 2010
6007 Posts
July 13 2011 17:09 GMT
#3
Why does it feel like this is a blog about penises.
I HAVE 5 TOAST POINTS
nekuodah
Profile Joined August 2010
England2409 Posts
July 13 2011 17:12 GMT
#4
Homework? :S
OpticalShot
Profile Blog Joined October 2009
Canada6330 Posts
July 13 2011 17:13 GMT
#5
^ agreeing with above replies.
[TLMS] REBOOT
2Pacalypse-
Profile Joined October 2006
Croatia9558 Posts
July 13 2011 17:15 GMT
#6
On July 14 2011 02:09 Serejai wrote:
Why does it feel like this is a blog about penises.

Because that's the TL's resident penis guy.
Moderator"We're a community of geniuses because we've found how to extract 95% of the feeling of doing something amazing without actually doing anything." - Chill
jorge_the_awesome
Profile Joined January 2011
United States463 Posts
July 13 2011 17:23 GMT
#7
I haven't had physics, so here are my guesses.
1: 1/4 F?????
2: No idea what STP is
3: Doesn't that depend on air composition/temp and the amount of force? Or is that taken care of by STP?
"Clothes are stupid"-Tastosis "Every dragoon that has ever been made is dumber than a bowl of hair" -Day[9] "Where are you going to take this skill now?" Stephano- "To the bank!" "Baby stuck under a car and you can't lift it up? What a wimp"-Artosis
Z3kk
Profile Blog Joined December 2009
4099 Posts
Last Edited: 2011-07-13 17:26:24
July 13 2011 17:26 GMT
#8
On July 14 2011 02:23 jorge_the_awesome wrote:
I haven't had physics, so here are my guesses.
1: 1/4 F?????
2: No idea what STP is
3: Doesn't that depend on air composition/temp and the amount of force? Or is that taken care of by STP?


STP is "standard temperature and pressure". Isn't this just basic high school physics homework?
Failure is not falling down over and over again. Failure is refusing to get back up.
CrazyF1r3f0x
Profile Blog Joined August 2010
United States2120 Posts
July 13 2011 17:51 GMT
#9
On July 14 2011 02:15 2Pacalypse- wrote:
Show nested quote +
On July 14 2011 02:09 Serejai wrote:
Why does it feel like this is a blog about penises.

Because that's the TL's resident penis guy.

Funny, My quote is also from this thread ^^
"Actual happiness always looks pretty squalid in comparison with the overcompensations for misery."
EsX_Raptor
Profile Blog Joined February 2008
United States2802 Posts
Last Edited: 2011-07-13 18:08:34
July 13 2011 18:07 GMT
#10
Not homework, just erecting a series of math/compsci blogs that get harder over time. That is, if you guys don't pull out.

But try to solve them. That will improve your shots at getting hotter jobs that don't blow so bad.

Edit: Posted the answer to the first problem.
ComaDose
Profile Blog Joined December 2009
Canada10357 Posts
July 13 2011 18:11 GMT
#11
omg i tried to do it and got he should have to push harder which i assume is wrong...
im just going to write thick and long.
BW pros training sc2 is like kiss making a dub step album.
xarthaz
Profile Blog Joined August 2010
1704 Posts
July 13 2011 18:18 GMT
#12
ˇwhers the force come from, please explain. pressures must be equal? Why not forces? How does it come.
Aah thats the stuff..
Serejai
Profile Blog Joined September 2010
6007 Posts
July 13 2011 18:20 GMT
#13
On July 14 2011 03:07 EsX_Raptor wrote:
Not homework, just erecting a series of math/compsci blogs that get harder over time. That is, if you guys don't pull out.

But try to solve them. That will improve your shots at getting hotter jobs that don't blow so bad.

Edit: Posted the answer to the first problem.


I see what you did there.
I HAVE 5 TOAST POINTS
Roffles *
Profile Blog Joined April 2007
Pitcairn19291 Posts
July 13 2011 18:29 GMT
#14
Rofl
God Bless
TerraTron
Profile Joined March 2010
Canada137 Posts
July 13 2011 18:51 GMT
#15
i almost choked on laughter at that subtle paragraph
moltenlead
Profile Joined December 2010
Canada866 Posts
July 13 2011 19:06 GMT
#16
.......................

You have got to be joking, but amusing nonetheless.
TheGiz
Profile Blog Joined October 2010
Canada708 Posts
July 13 2011 19:31 GMT
#17
+ Show Spoiler [Answer] +
The guy has more surface area with which to apply the same force. He wins.

What about long and thick?
Life is not about making due with what you have; it's about finding out just how much you can achieve. Never settle for anything less than the best. - - - Read my blog!
edc
Profile Blog Joined May 2011
United States666 Posts
July 13 2011 19:38 GMT
#18
This is so sexual and hilarious. Keep it up.
“There are two kinds of people in this world, those with loaded guns, and those who dig. You dig.” - Clint Eastwood
dudeman001
Profile Blog Joined February 2010
United States2412 Posts
July 13 2011 20:11 GMT
#19
On July 14 2011 03:07 EsX_Raptor wrote:
Not homework, just erecting a series of math/compsci blogs that get harder over time. That is, if you guys don't pull out.

But try to solve them. That will improve your shots at getting hotter jobs that don't blow so bad.

Edit: Posted the answer to the first problem.

The reply made this thread amazing. lol thank you EsX_Rator, I learned something today. :D
Sup.
Z3kk
Profile Blog Joined December 2009
4099 Posts
July 13 2011 20:52 GMT
#20
On July 14 2011 04:31 TheGiz wrote:
+ Show Spoiler [Answer] +
The guy has more surface area with which to apply the same force. He wins.

What about long and thick?


+ Show Spoiler +
actually, the guy has to apply more force, as evidenced by the answer OP posted lol

pressure = force per unit area, so to have equal amount of pressure applied, the guy has to apply four times the force the girl does...
Failure is not falling down over and over again. Failure is refusing to get back up.
Gnial
Profile Blog Joined July 2010
Canada907 Posts
Last Edited: 2011-07-13 21:04:11
July 13 2011 21:03 GMT
#21
I think this is secretly an ethics question disguised as a math question.

Syringes, a little girl, penises, applying force...

I am going to answer: immoral.
1, eh? 2, eh? 3, eh?
Sotamursu
Profile Joined June 2010
Finland612 Posts
July 13 2011 22:08 GMT
#22
On July 14 2011 05:52 Z3kk wrote:
+ Show Spoiler +
actually, the guy has to apply more force, as evidenced by the answer OP posted lol

pressure = force per unit area, so to have equal amount of pressure applied, the guy has to apply four times the force the girl does...

+ Show Spoiler +
Actually having a penis instantly makes everything you do 4 times more efficient so he only needs to be as strong as the girl.
venomium
Profile Joined October 2010
Netherlands245 Posts
Last Edited: 2011-07-14 00:16:30
July 14 2011 00:12 GMT
#23
You got this all wrong. But I can see where your calculations began derailing; there are 3 main factors:
• The female shouldn’t be a ‘little girl’; this starts implying that even though she can create F (force) as great or greater than the male, she still seems weaker.
This is a matter of perception and reader- delusion. I suggest you edit the subject from ‘little girl’ to ‘lady’.
If you want a visual aid to get my point:
+ Show Spoiler +
[image loading]


• The second factor is that you’re trying to make this equation gravity-neutral, even though we are great fans of Affirmative Action and thus should help the so-called ‘weaker-sex’ by enabling her with the powers of gravity; reversing the image to this point:
+ Show Spoiler +
[image loading]

• To further balance the scales, we should give the lady more surface area to apply pressure to, while we give the guy some solid ground from where he can push the syringe. This would lead in the lady getting the new syringe ‘A’ and the guy syringe ‘B’ and apply pressure like this:
+ Show Spoiler +
[image loading]



Now we can truly look at the equation, now that reader-delusions are removed and we’ve taken Affirmative Action.
While the lady has a better grip on the syringes on the 3 main attachmentpoints (FA), allowing her to make most of her multitasking abilities (MA), the guy has a more focused linear pressurepoint (FB), enabling him to use the fullest of his one-track mindedness (OTM).
This gives us the following equation:

Assume both syringes can hold the same volume V, the uncompressible liquid between them is also V, and the radius of syringe B is equal to twice the radius of syringe A.
FB*1 OTM = FA*3MA
Now, knowing that using the MA on 3 different routes will definetely open up 1 unit of MA to think of STP (Standard Temperature and Pressure); creating the following disturbance in the equation:
FB*1 OTM > FA*3MA-1MA(STP); ending the equation with this:
+ Show Spoiler +
[image loading]


In conclusion, as the formula proves; the guy will win this using these variables and the lady will end up being overpowered, by his build-up pressure.

" I think we finally found the magic number of guns needed to be pointed at the TL hive mind to deter sexual molestation (9)" -Coagulation
XXGeneration
Profile Blog Joined November 2010
United States625 Posts
July 14 2011 01:04 GMT
#24
Okay, even though this is obviously a joke thread, here are my answers.

1. Let's say that the radius of the girl's syringe is R, and the radius of the guy's syringe is 2R. The surface area of their respective syringes are then piR^2 and pi(2R)^2 or pi4R^2. If the force applied by the girl is Fa and the force applied by the guy is Fb, and the pressures applied by both must be equal, then you can set them equal to each other through Fa/(piR^2) = Fb/(pi4R^2) and get 4Fa = Fb.

2. Following the ideal gas law, PV=nRT, we can see that all the variables (volume, number of moles, temperature) excluding pressure are the same for both of them. Therefore, we can omit them and judging by the answer in question 1, we can conclude that the result will be the same; the guy must apply 4x the pressure to equalize it with air at standard temperature and pressure.

3. Now, because they are applying enough pressure to make sure that they both have the same volume, we can choose one of the sides and calculate, using Boyle's Law (P1V1 = P2V2). Pressure we have already determined to be Fa/(piR^2) for the girl, and the new volume will be V2. The original volume is V, and the original pressure we can assume to be 1 atmosphere. Therefore, we have (1)(V) = [Fa/(piR^2)][V2]. We are solving for V2, so we simplify to get V(piR^2)/Fa = V2.

To make that seem a bit easier to relate to , let's assign some values. Say the volume of the air is 1 liter (that's a big syringe), the radius of the "syringe" is 1/4 of a meter, and the force applied is 1 N. Then, we have (1 liter)(1 atmosphere)(pi/16 square meters)/1N = V2. This simplifies to (1 liter)(1 atm)(0.2 pascals^-1) = V2. Skipping some retarded conversions, we arrive at V2 ~= 0.000002 liters or 0.002 mL (which is a rather small syringe).



+ Show Spoiler +
Yes, I know OP probably wanted to make penis jokes. The joke is on him; the last figure is the volume of his penis!
"I was so surprised when I first played StarCraft 2. I couldn't believe that such an easy game exists... I guess the best way to attract people these days is to make things easy and simple." -Midas
OmniEulogy
Profile Blog Joined July 2010
Canada6600 Posts
July 14 2011 01:09 GMT
#25
On July 14 2011 06:03 Gnial wrote:
I think this is secretly an ethics question disguised as a math question.

Syringes, a little girl, penises, applying force...

I am going to answer: immoral.


Lmao. I think you might be right!
LiquidDota Staff
Lennon
Profile Joined February 2010
United Kingdom2275 Posts
July 14 2011 02:01 GMT
#26
You best start believing in troll threads...
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