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The Maths Thread! |
kimcheeboi
Joined: Dec 19, 2003
Posts: > 500
From: Abducted by hot blondes to Les
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eidt:lets confine this craze to one thread, then!
Ok, since everyone is posting their math homework, i decided to post soemthing from 6 chapters ahead, just so i get a head start. 
find the area of the part of the parabloid z=x^2+y^2 that lies under the plane z=9
oh and prove that something can have an infinite surface area but a limited volume.
the prize?
You get a electronic pat on the back (fine, a gmail account if you want) and you get to go, "nanny nanny nanny, im smarter than you, esato!"
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"conspiraqcy theories"-meths
v= 
[ This Message was edited by: kimcheeboi on 2004-10-21 23:31 ] |
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Ayush
Joined: Sep 12, 2003
Posts: > 500
From: Hyderabad, india
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Ayush  |
plasmadog
Joined: May 06, 2004
Posts: > 500
From: Beantown, India
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what the heck's a parabloid?
like a parabola?? haven't even heard ot it!!
hmm...5 papers of math in engineering and i still can't solve it!!! |
Ayush
Joined: Sep 12, 2003
Posts: > 500
From: Hyderabad, india
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I'm not the only one.!
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maddav
Joined: Dec 01, 2002
Posts: 356
From: Nottingham, UK
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I would try and answer, but we haven't covered co-ordinate geometry in the x,y,z planes in maths yet, only x,y.
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[ This Message was edited by: maddav on 2004-10-21 19:57 ] |
kimcheeboi
Joined: Dec 19, 2003
Posts: > 500
From: Abducted by hot blondes to Les
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i'll give you all hints 
the first problem is solved with applying a simple double integral. A parabloid is a 3-d parabola.
problem 2:
use y=e^(-x), or something like that (gabriel's horn) |
masseur
Joined: Jan 03, 2003
Posts: > 500
From: Sydney, London
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Its not parabloid, its paraboloid and if memory serves this is a calculus question, specifically double integrals but again its been a very long time since I had to do this, in fact not since my scientific programming work at Plessey Research in the late 70's early 80's.
given that info I'll leave it for someone else to work out but its got my interested enough to read some of my old text books at the weekend because I always found calculus fun!
edit: oh! looks like you were giving the clues as I was writing this! oh well....
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[ This Message was edited by: masseur on 2004-10-21 20:20 ] |
plasmadog
Joined: May 06, 2004
Posts: > 500
From: Beantown, India
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Weekends at the Masseur house must be great fun! Seriously calculus? You must've been quite a nerd during school. Okay kim for the second one, you can use limits, so when area tends to infinity... You solve along those lines. Its 1am, will do the rest tomm:-).
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maddav
Joined: Dec 01, 2002
Posts: 356
From: Nottingham, UK
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Hey, I'm doing calculus next year. No fair 
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masseur
Joined: Jan 03, 2003
Posts: > 500
From: Sydney, London
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@plasmadog, no, just once in a while when something like this comes up it sparks my interest. its that or helpmy wife with her craft activities 
I was definitly no nerd at school, just top of the maths class but that was about the only subject I was top at, except IT which was brand new at my school in those days... punch cards and paper tape!
but we digress... I'm hoping someone will solve this soon
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kimcheeboi
Joined: Dec 19, 2003
Posts: > 500
From: Abducted by hot blondes to Les
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For 2 you use limits, but you gotta use them with improper integrals (volume and surface area). Geez i'm giving it away!
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Krubach
Joined: Dec 05, 2002
Posts: > 500
From: Sunny Portugal! :)
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@kimcheeboi
You really need to get a life...
[addsig] |
kimcheeboi
Joined: Dec 19, 2003
Posts: > 500
From: Abducted by hot blondes to Les
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Lol it's called school :xx , and if you didn't know calculus is my fav ;-)
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maddav
Joined: Dec 01, 2002
Posts: 356
From: Nottingham, UK
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I can't wait for next year, A-Level maths
Do you mind if i post my own question here Kim?
(Maybe we could start a thread...)
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[ This Message was edited by: maddav on 2004-10-21 21:35 ] |
Payalnik
Joined: Jan 01, 2004
Posts: 380
From: Moscow
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The first is very easy, but i'm almost asleep, so maybe tomorrow when i get a sheet of paper. The proof of the 2nd is a simple plane.
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Posted: 2004-10-21 20:15
