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2003 Paper 2 Question 9 - HSN forum

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2003 Paper 2 Question 9


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#1 coca

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Posted 02 May 2005 - 09:32 PM

Argh! This one has tripped me up.
<MrBob> I hate Uni. At least in film studies we get to talk about Fight Club.
<@X-Factor> Wouldnt you be breaking the first 2 rules?


#2 Mr H

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Posted 02 May 2005 - 09:45 PM

a.(a+b)=36
a.a+a.b=36
5 power2.gif + 5.4.cos theta.gif=36
25+20cos theta.gif=36
20cos theta.gif=11
cos theta.gif=11/20
theta.gif=56.6 degree.gif

H tends 2 infinity

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#3 coca

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Posted 02 May 2005 - 09:53 PM

Oh I see! I didn't know it could multiply out like that

Thanks a lot biggrin.gif
<MrBob> I hate Uni. At least in film studies we get to talk about Fight Club.
<@X-Factor> Wouldnt you be breaking the first 2 rules?


#4 Soph.E.

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Posted 19 May 2005 - 03:44 PM

I understand the multiplying out of a.(a.b) to get a.a=a.b and then getting

a.b = 20cos theta.gif

but what's wrong with a.a = 25 cos theta.gif? Why is it just 25? Once I get this the rest is fine though

#5 eck231

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Posted 19 May 2005 - 03:50 PM

Technically it is a.a = 25cosØ
as it is a straight line the cosØ is cos0

this means a.a= 25cos0

As cos0 =1 it simply becomes 25!

Hope this helps

#6 Soph.E.

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Posted 19 May 2005 - 03:56 PM

Ohhhh I get it now happy.gif silly me that was kinda dumb! Thank you!





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