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> The Last Maths Question, impossible?? help!
the lil' pie...
post Mar 24 2004, 09:42 PM
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ok. if anyone is any good at maths (and ask anyone you speak to asap, this is one hell of a plea) how the hell do i do this??:

a stone slides in a straight line across a frozen pond. given that the initial speed of the stone is 5m/s and that it slides 20m before coming to rest, calculate the coefficient of friction between the stone and the surface of the frozen pond.

so, in terms of formulae: u is 5, v is 0, s (distance) is 20m, i figured out acceleration (a) is 0.625 m/s/s and time taken for that is 8s
to find the coefficient, i need to use F=mu x R (mu being the greek letter i don't have a character for on me keyboard)
F being the frictional force, which should be 0 but can't be.
R is the reaction force, which is equal to weight, but from the data given i don't know how to get weight blink.gif
F=P but i can't figure out P, because i'd need to use F=ma (ie mass (which i don't have) times a, which i have, but it isnt any good on its own)

ARGHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH mad.gif please help....


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Jaq
post Mar 24 2004, 10:23 PM
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Took this grammar!
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...

I hate math.


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Pab
post Mar 24 2004, 10:24 PM
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I cannot begin to describe how long it is since I've had one of these to solve ... But it looks like a sick perverted form of fun, so I'm gonna give it a go.

(edited to remove false information)


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sjbbandgeek
post Mar 24 2004, 11:45 PM
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The stone breaks the ice and falls into the pond?
The answer is six?
I wouldn't trust my math skills too much.
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Tigersong
post Mar 25 2004, 12:02 AM
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Okay, I'll try to explain it using your formulae, which is kind of difficult, because we use different symbols over in North America, but...

F=(mu X R)

R = mg (where m = mass of the stone, g = acceleration of gravity)

F=ma (where m - mass of stone, a =acceleration of stone)

therefore

ma = (mu X mg)

masses cancel, giving you

a=mu X g

Since you know a (which you said you already calculated) and g, you can therefore calculate mu.

mu = a/g

Hope this helps!


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the lil' pie...
post Mar 25 2004, 09:16 AM
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OMG IT WORKS!! I LOVE YOU!!

i'm sending you money laugh.gif biggrin.gif


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spiffilicious05
post Mar 25 2004, 06:43 PM
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I was good at maths up until this year.

Now I'm just barely passing.

I don't know what happened but I hate math.


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WeeJ
post Mar 25 2004, 06:51 PM
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Twelvty!


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Spacehappy
post Mar 25 2004, 07:49 PM
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QUOTE (WeeJ @ Mar 25 2004, 06:50 PM)
Twelvty!

Seconded laugh.gif
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Cath Sparrow
post Mar 25 2004, 07:52 PM
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I think your both wrong and it's Armadillo!!!! tongue.gif


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Usurper MrTeapot
post Mar 25 2004, 07:57 PM
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QUOTE (Cath @ Mar 25 2004, 07:51 PM)
I think your both wrong and it's Armadillo!!!! tongue.gif

Almost, you forgot to carry the one and divide by 5. Its Elephant of course...


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Mata
post Mar 26 2004, 02:34 AM
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I'm not sure, but I could program a game in Flash based on it, therefore in my head I know all the mathematics that I need biggrin.gif


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Sir Psycho Sexy
post Mar 26 2004, 02:49 AM
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failing that you could go with the old maths back up and put 42 as the answer tongue.gif

speaking of funny test answers, i remember someone put "because its magic" as an answer on a chemistry test, i had a giggle at that


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Gothymothy girl
post Mar 26 2004, 04:54 AM
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QUOTE
Twelvty!


QUOTE
Seconded


Seconded for a second time.



(Is the answer twelve?)


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Tigersong
post Mar 26 2004, 06:31 AM
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QUOTE (the lil' pie fairy @ Mar 25 2004, 03:15 AM)
OMG IT WORKS!! I LOVE YOU!!

i'm sending you money laugh.gif biggrin.gif

Not a problem! My pleasure.

(Plus, it made me feel smart and competent at school work again... which hasn't happened for a long long time biggrin.gif)

Ooo! British money! But isn't it heavy? I mean, it's in pounds, no? (tongue.gif Sorry, lameass joke. But I'm very very tired right now. tongue.gif)

Or, you could just send me your adoration and praise! biggrin.gif

If you have any more problems, don't hesitate to ask. I've taken waaaaaay too many math and physics courses over my long and varied school career.


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Thou shalt not lie with a man as with a woman; it is an abomination. Thou shalt do it standing up.
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the lil' pie...
post Mar 26 2004, 08:59 AM
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Don't you just love hot water bottles?
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oh the can of worms you've just opened...i've got exams soon...you're gonna hate me rolleyes.gif


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It's not so bad being trendy, everyone who looks like me is my friend...

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beleraphon
post Mar 29 2004, 11:30 PM
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Has too much time on their hands
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You need a hand with a math problem that can be solved remotely via this wonderful internet thingy let me know.

I'm kind of good at mathamatics particulaly mechanics, fluid dynamics, numerical solutions and basic economics/accountancy.

But be warned, I ended up with an MSc. and a job in an insurance company...
...and no, I don't know what I did in a past life to deserve it, but it must have been bad!

bel.


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