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Ad Maths Problem
Posted: Thu Sep 24, 2009 3:48 pm
by Allan Harmer
My daughter is doing GCSE Add'lMaths in year 11 as she managed to get an A grade GCSE a year early.
She has been set a problem that she can't solve. We have tried the internest and physics books to understand the principle required but can't find it
What she is trying to do is calculate the centre of mass of a cone and determine where the balance point is on one of the sloping sides.
Thanks for any help in advising what prinicple is required here.
Cheers!
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 3:50 pm
by Jon Corby
Made you look
(sorry, no idea)
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 4:04 pm
by Sue Sanders
Jon Corby wrote:Made you look
(sorry, no idea)
Evil C**T (In the light of the recent Nigelgate incident, I've used the clevertabloid press letter, asterix, asterix, letter method to disguise the word CUNT)
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 4:08 pm
by Kieran Child
I can do this with integration but I'm not sure she'll have covered that by GCSE?
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 4:11 pm
by Kieran Child
Kieran Child wrote:I can do this with integration but I'm not sure she'll have covered that by GCSE?
Screw that. After going at it for a long time I've come to the following conclusion:
SPOILER
SPOILER
OMGSPOILERZ
The centre of mass is 1/4 of the way up from the centre of the base circle.
If she needs to do working, then I did a fuckload, but this may not be helpful, so it may be useful for you to know that that's the answer you're working towards? or you could just state it.
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 4:24 pm
by Charlie Reams
The first Google result for "centre of mas of a cone" gives you the answer, assuming you can use calculus, which IIRC is taught in Add Maths.
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 6:57 pm
by Gavin Chipper
Charlie Reams wrote:The first Google result for "centre of mas of a cone" gives you the answer, assuming you can use calculus, which IIRC is taught in Add Maths.
It's true. It says:
If you cannot use calculus, please close this page immediately. Do not read on. Gone? Good. A solid cone has its centre of mass 1/4 of the way along the line from the centre of the base to the vertex.
Re: Ad Maths Problem
Posted: Thu Sep 24, 2009 8:15 pm
by Allan Harmer
Thank you all for your trouble guys. She has only just started the syllabus and hasn't done calculus or integration yet.
I think the teacher set them this to make them think and use it as in into to calculus and integration.
She had sort of worked out that it was about a 1/3 of the way up so now that she knows it is 1/4 the way up she can work back to it.
Rachael has asked me to thank you all very much.
Al