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PostPosted: Mon Jul 14, 2008 9:10 pm 
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Joined: Fri Jan 25, 2008 10:18 pm
Posts: 273
hi all,

I wonder if someone can help me with the following question please

There is a picture of a donkey tethered to an upright post with a piece of string and the question is as follows:

'A donkey is tethered by a piece of rope to an upright post , in the middle of a large field. Name the mathematical shape of the patch of grass in which the donkey can graze.'

First thoughts are a circle but we think it's too easy an answer and we are missing something!

Thanks in advance

Regards
Coolmum


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PostPosted: Tue Jul 15, 2008 1:09 pm 
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Joined: Thu Nov 02, 2006 3:07 pm
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Location: Finchley - Barnet
No you are not! It refers to a circle. This question has now made at least three appearances in this forum precicely because it is to easy to believe its true!

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PostPosted: Tue Jul 15, 2008 5:46 pm 
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Joined: Fri Jan 25, 2008 10:18 pm
Posts: 273
Thanks SJ355!!

It is a too good to be true question particularly as it was q24 on the paper - these are usually too hard for me too do!! Hence my doubt re my ability to answer so quickly :)

REgards
Coolmum


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PostPosted: Tue Jul 15, 2008 7:56 pm 
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Joined: Wed Jan 02, 2008 12:18 pm
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Location: kent
Maybe it should not be as simple as this.

If the tether was tied in such a way that the rope wrapped around the post as the donkey walked around the post (assuming that the donkey will wish always to keep the rope taut, as though trying to escape from the tether), and the donkey ate a very narrow line of grass on each journey around the post, it would create a line of short grass in the shape of a spiral. But it would be a spiral with the middle missing as at some point the donkey will be unable to continue all the way to the centre of the spiral as the rope will be too short.

I don't know the name of this. What were the options in the multiple choice answers?


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PostPosted: Wed Jul 16, 2008 12:51 pm 
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Location: Finchley - Barnet
Quote:
If the tether was tied in such a way that the rope wrapped around the post as the donkey walked around the post (assuming that the donkey will wish always to keep the rope taut, as though trying to escape from the tether), and the donkey ate a very narrow line of grass on each journey around the post, it would create a line of short grass in the shape of a spiral. But it would be a spiral with the middle missing as at some point the donkey will be unable to continue all the way to the centre of the spiral as the rope will be too short.


Perplexed,

No wonder you are perplexed. Now I am as well :)

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sj355


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PostPosted: Fri Jul 18, 2008 9:57 am 
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Joined: Sat Nov 04, 2006 4:23 pm
Posts: 125
Location: Dudley, West Midlands
sj355 wrote:
No you are not! It refers to a circle. This question has now made at least three appearances in this forum precicely because it is to easy to believe its true!


If the Donkey were tethered with a rigid rod then it can graze a circle. Tethered with a string it can graze a disc.


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 Post subject: donkey
PostPosted: Fri Jul 18, 2008 10:37 am 
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Location: Solihull, West Midlands
Quote:
Tethered with a string it can graze a disc


...always assuming a mathematically tidy post of infinitesimal diameter....


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 Post subject: Re: donkey
PostPosted: Fri Jul 18, 2008 5:56 pm 
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Location: Dudley, West Midlands
solimum wrote:
Quote:
Tethered with a string it can graze a disc


...always assuming a mathematically tidy post of infinitesimal diameter....


... and that the string is long enough to allow the donkey's (teeth | legs) to reach the ground. I'm sure this was made clear in the original question :-)

Circle? disc? annulus? I do wonder which answer is in the marking scheme? I have a horrible feeling it could actually be 'circle', which is clearly wrong.

I hate this type of question when it's combined with mass testing and a rigid marking scheme; where you're tutoring children to 'guess what the examiner wants', even asking the brightest children to 'dumb-down' the level of their answers to suit the test.


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PostPosted: Fri Jul 18, 2008 9:17 pm 
I have used some of these papers for tutoring my students in Birmingham. Where would I find a 2003 paper?


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PostPosted: Sat Jul 19, 2008 7:32 pm 
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Joined: Sun Apr 27, 2008 9:21 pm
Posts: 18
Location: Hertfordshire
Hi

My son also did one of the Habs past Maths paper. Does anyone know if there are answers available please? We have struggled with some and would like some help. Or can I ask here for help?

Thanks


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