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October 19, 2025, 07:14:17 am
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Author Topic: itute 2010  (Read 1067 times)  Share 

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Martoman

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itute 2010
« on: October 11, 2010, 08:33:02 pm »
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i refuse to believe question 9. It says that the diagonal can be described by PR is 1/2(OP PLUS OR). No. I think with vectors its 1/2(OR MINUS OP). Anyone feel the same way? or have a missed something fundamental?
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
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googoo

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Re: itute 2010
« Reply #1 on: October 11, 2010, 09:17:56 pm »
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could you elaborate
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Martoman

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Re: itute 2010
« Reply #2 on: October 11, 2010, 10:17:22 pm »
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Err say any rectangle in space. Its sides are ABCD. AC = AD. Now AC = OC-OA yes? and so AX which is the midpoint is 1/2(OC-OA) and NOT 1/2(OC+OA)???
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
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Swedish meal time all the time

luken93

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Re: itute 2010
« Reply #3 on: October 11, 2010, 10:19:12 pm »
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Quote from: Martoman on October 11, 2010, 08:33:02 pm
i refuse to believe question 9. It says that the diagonal can be described by PR is 1/2(OP PLUS OR). No. I think with vectors its 1/2(OR MINUS OP). Anyone feel the same way? or have a missed something fundamental?
whatever martoman says goes :)
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2010: Business Management [47]
2011: English [44]   |   Chemistry [45]  |   Methods [44]   |   Specialist [42]   |   MUEP Chemistry [5.0]   |   ATAR: 99.60
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2012: MBBS I @ Monash

Martoman

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Re: itute 2010
« Reply #4 on: October 11, 2010, 10:22:40 pm »
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LOL...............

I must be missing something or itute have just failed on a 5 mark question in their newest exam.. you'd think they'd check these things..
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
___________________________________
Swedish meal time all the time

luken93

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Re: itute 2010
« Reply #5 on: October 11, 2010, 10:24:03 pm »
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Quote from: Martoman on October 11, 2010, 10:22:40 pm
LOL...............

I must be missing something or itute have just failed on a 5 mark question in their newest exam.. you'd think they'd check these things..
Thats your job haha
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2010: Business Management [47]
2011: English [44]   |   Chemistry [45]  |   Methods [44]   |   Specialist [42]   |   MUEP Chemistry [5.0]   |   ATAR: 99.60
UMAT: 69 | 56 | 82 | = [69 / 98th Percentile]
2012: MBBS I @ Monash

itolduso

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Re: itute 2010
« Reply #6 on: October 11, 2010, 10:52:18 pm »
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please explain
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roberto

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Re: itute 2010
« Reply #7 on: October 12, 2010, 01:21:53 am »
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Quote from: itolduso on October 11, 2010, 10:52:18 pm
please explain
ditto. i don't get it?
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googoo

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Re: itute 2010
« Reply #8 on: October 12, 2010, 12:12:44 pm »
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Quote from: Martoman on October 11, 2010, 08:33:02 pm
i refuse to believe question 9. It says that the diagonal can be described by PR is 1/2(OP PLUS OR). No. I think with vectors its 1/2(OR MINUS OP). Anyone feel the same way? or have a missed something fundamental?
What is the problem?
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kamil9876

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Re: itute 2010
« Reply #9 on: October 12, 2010, 01:05:09 pm »
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Quote from: Martoman on October 11, 2010, 10:17:22 pm
Err say any rectangle in space. Its sides are ABCD. AC = AD. Now AC = OC-OA yes? and so AX which is the midpoint is 1/2(OC-OA) and NOT 1/2(OC+OA)???

You are confusing position vectors with other kinds of 'displacement' vectors. 0.5(OC+OA) gives the position vector of the midpoint of C and A, ie OX.

You got the expression for AX right but to get OX you need to notice: OX=OA+0.5(OC-OA) since you are travelling starting from A to get to X. 0.5(OC-OA) is the displacement going from A to X.
« Last Edit: October 12, 2010, 01:10:35 pm by kamil9876 »
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Voltaire: "There is an astonishing imagination even in the science of mathematics ... We repeat, there is far more imagination in the head of Archimedes than in that of Homer."
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