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Author Topic: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!  (Read 6801 times)

Offline Galleria

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HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« on: October 31, 2010, 09:03:59 am »
HI
HELP
I HAVE MATH PAPER 2 TOMORROW
AND I AM UNABLE TO DO THESE QUESTIONS

Math, Paper 2:

M/J 2003 Q 17
M/j 2006 Q 14, 26
O/N 2007 No 15
O/N 2008 no 17
HELPHELPHELP
I DONT GET IT
>___<
and i dont get vectors : |
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Offline Ivo

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #1 on: October 31, 2010, 10:22:00 am »
Quote from: Galleria on October 31, 2010, 09:03:59 am
O/N 2008 no 17

a) i) Basically it's asking \vec{OA}.  So -3\mathbf{p} - 2\mathbf{q}.

    ii) Applying the same principle, -3\mathbf{p} + 4\mathbf{q}.
 
    iii) -3\mathbf{p} + 4q - \mathbf{p} - 4\mathbf{q}, which simplifies to -4\mathbf{p}.
« Last Edit: October 31, 2010, 10:26:08 am by Ivo »
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Always willing to help!  8)
"In helping others, we shall help ourselves, for whatever good we give out completes the circle and comes back to us."

Offline Ivo

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #2 on: October 31, 2010, 10:38:34 am »
Quote from: Galleria on October 31, 2010, 09:03:59 am
O/N 2007 No 15

a) We know that \mathbf{a} essentially has 6 units, so \frac{1}{3} of 6 is 2, so \frac{1}{3}\mathbf{a} is 2 units 'up' \vec{OA}.  Similarly, \mathbf{b} has 6 units, so \frac{2}{3} of 6 is 4, so \frac{2}{3}\mathbf{b} is 4 units along direction \vec{OB}.  Answer attached.

b) Applying the same principle, then \vec{OE} is \frac{1}{2}\mathbf{a} + \frac{1}{3}\mathbf{b}.

c) Same principle, but now going in -\mathbf{a} direction, so -\frac{1}{2}\mathbf{a} + \frac{2}{3}\mathbf{b}.

Hope that clears up your doubt! 8)
« Last Edit: October 31, 2010, 10:51:32 am by Ivo »
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Offline Arthur Bon Zavi

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #3 on: October 31, 2010, 10:46:12 am »
Quote from: Galleria on October 31, 2010, 09:03:59 am
HI
HELP
I HAVE MATH PAPER 2 TOMORROW
AND I AM UNABLE TO DO THESE QUESTIONS

Math, Paper 2:

M/J 2003 Q 17
M/j 2006 Q 14, 26
O/N 2007 No 15
O/N 2008 no 17
HELPHELPHELP
I DONT GET IT
>___<
and i dont get vectors : |


first read this:

https://studentforums.biz/math-147/transformation-martices-igcse/ (Reply 2)

M/J 2003 Q 17

in (A) you have to draw the shear, i.e the point (0,2) should map onto point (3,2).
in (b)(i) you have to stretch the shear at the given point. This is one way stretch, know the matrix from the site above.
in (b)(ii) you have to write the matrix of the stretch (Before that look at the above site).
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Offline Arthur Bon Zavi

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #4 on: October 31, 2010, 10:59:36 am »
Quote from: Galleria on October 31, 2010, 09:03:59 am

M/J 2006 Q 14, 26


(14)(a) 44 : 32 = 11 : 8, i.e 1.375 . This is increased by 5 : 4, i.e 1.25.
Therefore, 44 * 1.25 = 55 and 32* 1.25 = 40.

Therefore measurements of the larger screen is 55 cm and 40 cm.

(14)(b) Model A screen area     44 X 32      1408       16
            ----------------------- = --------- =  ------ = ------
            Model B screen area     55 X 40      2200        25

(26) Sorry but Q-26 does not exist.

Hope this was been of help. ;)

Don't worry.
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Offline Arthur Bon Zavi

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #5 on: October 31, 2010, 11:03:16 am »
Refer this site for vectors :

http://www.physics.uoguelph.ca/tutorials/vectors/vectors.html

Also this (Ignore it if you don't understand)..

http://en.wikipedia.org/wiki/Euclidean_vector
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Offline Arthur Bon Zavi

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #6 on: October 31, 2010, 11:05:26 am »
« Last Edit: October 31, 2010, 11:07:29 am by Ancestor »
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Alpha

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #7 on: October 31, 2010, 11:13:53 am »
Wow, Ancestor and Ivo, you came before I did.

Wonderful. +reps for both. ;)
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Offline Arthur Bon Zavi

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #8 on: October 31, 2010, 11:21:05 am »
Quote from: ~Alpha on October 31, 2010, 11:13:53 am
Wow, Ancestor and Ivo, you came before I did.

Wonderful. +reps for both. ;)

Thank you Alpa. :D
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Offline Galleria

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #9 on: October 31, 2010, 11:25:51 am »
OMG
THAAAANKS!
=D
LOL TEEHEE =D
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Offline Galleria

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #10 on: October 31, 2010, 11:27:42 am »
lol do you have a site like that for studying inequalities ?
i did a 5 mark question and got 1 lol
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elemis

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #11 on: October 31, 2010, 11:34:55 am »
Quote from: Galleria on October 31, 2010, 11:27:42 am
lol do you have a site like that for studying inequalities ?
i did a 5 mark question and got 1 lol

http://www.numberpower.org/BeyondBasics/Inequalities/html/Inequalitiesbasics.html

You should see these titles :
Quote
Negative Variable
   
1-Step Addition & Subtraction
   
2-Step Addition & Subtraction
   
1 & 2-Step Multipication
   
1 & 2-Step Division

Those are videos. Watch them
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Offline Arthur Bon Zavi

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #12 on: October 31, 2010, 11:37:55 am »
Quote from: Galleria on October 31, 2010, 11:25:51 am
OMG
THAAAANKS!
=D
LOL TEEHEE =D

Your welcome, thanks Ari, I was going to do that. :D
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Offline Galleria

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #13 on: October 31, 2010, 12:02:54 pm »
thaaaanks  ;D
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Offline ~aanchal~

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Re: HELPHELPHELPHELPHELP! I HAVE EXAMS TOMORROW!
« Reply #14 on: October 31, 2010, 01:00:48 pm »
Quote from: Galleria on October 31, 2010, 09:03:59 am
HI
HELP
I HAVE MATH PAPER 2 TOMORROW
AND I AM UNABLE TO DO THESE QUESTIONS

Math, Paper 2:

M/J 2003 Q 17
M/j 2006 Q 14, 26
O/N 2007 No 15
O/N 2008 no 17
HELPHELPHELP
I DONT GET IT
>___<
and i dont get vectors : |

same here best of luck
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