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Long and Thin or Short and Thick?

Blogs > EsX_Raptor
Post a Reply
1 2 Next All
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.
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