flak monkey
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| posted on 20/3/07 at 12:28 PM |
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A challenge for you...
Can someone rearrange this formula for H please?
V= pi*h((c^2)/8 + (h^2)/6)
Cheers,
David
Sera
http://www.motosera.com
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mookaloid
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| posted on 20/3/07 at 12:37 PM |
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Is it possible?
"That thing you're thinking - it wont be that."
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Mr Whippy
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| posted on 20/3/07 at 12:44 PM |
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What a splendid arrangement!
H = 2268chhpiV^^//+= *((()))
Fame is when your old car is plastered all over the internet
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nib1980
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| posted on 20/3/07 at 12:57 PM |
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I think its
h = sqrt(6*((v/(pi*h))-((C^2)/8))
some one check my working please
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Sporty
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| posted on 20/3/07 at 01:00 PM |
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I agreee with your working so far but I suppose it is not a lot of help with h on both sides of the equation.
Will ask around the office see if anyones maths is up to it.
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nib1980
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| posted on 20/3/07 at 01:02 PM |
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quote:
Originally posted by Sporty
I agreee with your working so far but I suppose it is not a lot of help with h on both sides of the equation.
Will ask around the office see if anyones maths is up to it.
crap...... 
I never like thermodynamics anyway, I'll have another go
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nib1980
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| posted on 20/3/07 at 01:13 PM |
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ignoring previous attempt, got it now
I think
h = sqrt (6(V/(pi^2(c^2/8)))
again check the working and laugh at me again
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Bluemoon
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| posted on 20/3/07 at 01:13 PM |
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nib1980,
I think you get, h = +/- sqrt((6/v)-(6/(8*pi))*c^2)
Dan
[Edited on 20/3/07 by Bluemoon]
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nib1980
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| posted on 20/3/07 at 01:15 PM |
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quote:
Originally posted by Bluemoon
nib1980,
I think your correct, I get, h = +/- sqrt((6/v)-(6/(8*pi))*c^2)
Dan
thanks but which one so I can delte the other. before some of us get really confused ha ha
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cossey
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| posted on 20/3/07 at 01:19 PM |
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it is a quadratic in h so it is 6*(-pi*(c^2)/8+/- sqrt(pi^2c^4/64 + 4V/6)
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matt_gsxr
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| posted on 20/3/07 at 01:19 PM |
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Difficult to do analytically, see cubic equation in wikipedia, as methods depend a bit on the values (unlike the quadratic formula which is nice and
simple).
If you have values that you can plug in then, first rearrange to
8hhh + 0 hh + 6cc h - 48V/pi = 0
then plug into the 8, 0, 6cc and -48V/pi into the solver at
http://www.akiti.ca/Quad3Deg.html
Alternatively you can battle through the wikipedia maths, but it doesn't look like fun to me.
Matt
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Bluemoon
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| posted on 20/3/07 at 01:28 PM |
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Opps, I thought that was a pih/(.....).. I'll get my coat..
As pointed out it's actually a qubic equation, and I think you can only solve it using an iterative method...
Dan
But having read, bit looks like you can solve it but it's not easy!
[Edited on 20/3/07 by Bluemoon]
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flak monkey
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| posted on 20/3/07 at 01:50 PM |
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Thanks guys, its not possible to rearrange it anyway according to our maths geniuses, managed to sort it out now anyway. Was trying to work out some
combustion chamber volumes for one of the technicians at uni.
Thanks for the help
David
Sera
http://www.motosera.com
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ned
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| posted on 20/3/07 at 01:54 PM |
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WHOOOOOOSH
straight over my head!
beware, I've got yellow skin
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Chippy
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| posted on 20/3/07 at 02:08 PM |
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Just reading this thread has given me a head ache, think I'll go and lie down.  Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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Confused but excited.
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| posted on 20/3/07 at 04:01 PM |
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"Was trying to work out some combustion chamber volumes for one of the technicians at uni. "
Glad I've got a measuring cylinder! Being that clever is too much like hard work. 
Tell them about the bent treacle edges!
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flak monkey
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| posted on 20/3/07 at 04:02 PM |
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quote:
Originally posted by Confused but excited.
"Was trying to work out some combustion chamber volumes for one of the technicians at uni. "
Glad I've got a measuring cylinder! Being that clever is too much like hard work.
Its all theoretical at the moment. He is having some fun with a 50 cc moped engine and methanol... you'd never guess he spent years drag racing
Sera
http://www.motosera.com
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