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April 16, 2026, 06:47:20 pm
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Author Topic: I swear I hate vectors  (Read 3997 times)  Share 

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Glockmeister

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I swear I hate vectors
« on: June 23, 2008, 06:03:14 pm »
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From my assignment:

   Two objects, A and B, are moving so that their positions (in metres) from the origin O, at time t seconds are represented by the vectors,
   a(t) = 3ti + (1-t)j    and  b(t) = (3 + sin )i + (1 - cos )j,  t , respectively.
   (a) Find the exact position vector of each object at t = 2.
   (b) Find   in exact form at t = 2.
   (c ) Hence find the distance between the two objects at t = 2, correct to 2 decimal places.
   (d) At t = 2, an observer at O is looking at object A. Through what angle (correct to the nearest minute) must the observer turn to be looking at B?

I can do a,b and c, but I can't seem to get d
« Last Edit: June 23, 2008, 06:07:35 pm by Glockmeister »
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Mao

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Re: I swear I hate vectors
« Reply #1 on: June 23, 2008, 06:39:18 pm »
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at t=2











« Last Edit: June 23, 2008, 06:43:18 pm by Mao »
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Glockmeister

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Re: I swear I hate vectors
« Reply #2 on: June 23, 2008, 06:46:29 pm »
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That's the answer I got, but when I put it in the calc, it gives a domain error.
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[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

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Mao

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Re: I swear I hate vectors
« Reply #3 on: June 23, 2008, 08:31:38 pm »
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did you type it correctly? :P

« Last Edit: June 23, 2008, 08:33:38 pm by Mao »
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Glockmeister

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Re: I swear I hate vectors
« Reply #4 on: June 23, 2008, 11:14:55 pm »
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Heh, I get 19.something but I'm, going to trust your calculation more (I honestly gotta by that CAS calculator).
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[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

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ell

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Re: I swear I hate vectors
« Reply #5 on: June 23, 2008, 11:52:10 pm »
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Quote from: Glockmeister on June 23, 2008, 11:14:55 pm
Heh, I get 19.something but I'm, going to trust your calculation more (I honestly gotta by that CAS calculator).

You should get one, they're really worth the money.
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Glockmeister

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Re: I swear I hate vectors
« Reply #6 on: June 24, 2008, 12:41:57 am »
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sigh shouldve done methods CAS instead lol
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[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

2007: Mathematical Methods 37; Psychology 38
2008: English 33; Specialist Maths 32 ; Chemistry 38; IT: Applications 42
2009: Bachelor of Behavioural Neuroscience, Monash University.

Mao

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Re: I swear I hate vectors
« Reply #7 on: June 24, 2008, 02:56:14 pm »
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Quote from: Glockmeister on June 23, 2008, 11:14:55 pm
Heh, I get 19.something but I'm, going to trust your calculation more (I honestly gotta by that CAS calculator).

that was with a scientific calculator :P
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dcc

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Re: I swear I hate vectors
« Reply #8 on: June 24, 2008, 03:33:39 pm »
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Quote from: Glockmeister on June 24, 2008, 12:41:57 am
sigh shouldve done methods CAS instead lol

Glockmeister, you and me, with our rustic non-CAS calculator for Specialist will absolutely dominate it up :)  (Trust me, Spec examiners are not allowed to impart any large advantage on students who can afford a CAS calculator) :P
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Glockmeister

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Re: I swear I hate vectors
« Reply #9 on: June 24, 2008, 05:06:30 pm »
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Lol, your confident.

*dances with dcc*
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[22:07] <robbo> i luv u Glockmeister

<Glockmeister> like the people who like do well academically
<Glockmeister> tend to deny they actually do well
<%Neobeo> sounds like Ahmad0
<@Ahmad0> no
<@Ahmad0> sounds like Neobeo

2007: Mathematical Methods 37; Psychology 38
2008: English 33; Specialist Maths 32 ; Chemistry 38; IT: Applications 42
2009: Bachelor of Behavioural Neuroscience, Monash University.

Mao

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Re: I swear I hate vectors
« Reply #10 on: June 24, 2008, 05:35:32 pm »
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Quote from: dcc on June 24, 2008, 03:33:39 pm
Quote from: Glockmeister on June 24, 2008, 12:41:57 am
sigh shouldve done methods CAS instead lol

Glockmeister, you and me, with our rustic non-CAS calculator for Specialist will absolutely dominate it up :)  (Trust me, Spec examiners are not allowed to impart any large advantage on students who can afford a CAS calculator) :P

never~ :P

[i'm sure you are right :) ]
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/0

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Re: I swear I hate vectors
« Reply #11 on: June 25, 2008, 07:29:26 am »
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In the Methods CAS exam you're not allowed to bring in a non-CAS calculator! That means scientific calculators are not allowed! Lololololol that's a pretty stupid rule
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cara.mel

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Re: I swear I hate vectors
« Reply #12 on: June 25, 2008, 11:06:40 am »
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Quote from: DivideBy0 on June 25, 2008, 07:29:26 am
In the Methods CAS exam you're not allowed to bring in a non-CAS calculator! That means scientific calculators are not allowed! Lololololol that's a pretty stupid rule

Scientific calculators != non-CAS graphics calculators. You can have a scientific one and a graphics one, but not two graphics ones

http://www.vcaa.vic.edu.au/vce/studies/mathematics/approvedcalculators.html
"For specified mathematics examinations, either one approved graphics calculator or one approved CAS may be used, as applicable to that study. A scientific calculator may also be used if desired. Students are not allowed to take into any examination a CAS and a graphics calculator."
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/0

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Re: I swear I hate vectors
« Reply #13 on: June 26, 2008, 06:14:37 am »
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Well that's what i read on a handout
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Mao

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Re: I swear I hate vectors
« Reply #14 on: June 26, 2008, 12:28:14 pm »
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Quote from: DivideBy0 on June 26, 2008, 06:14:37 am
Well that's what i read on a handout

scientific calcs are definitely allowed.
i took both in and no one killed me :)
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