Lost And Found (1 Viewer)

[Rorix]

LOST: PARTICLE OF INFINITE SPEED. In an unfortunate mishap, the BoS released a particle which attained infinite speed after arctan 1/2 seconds. Warning: Take care when catching, the particle has infinite momentum and does not obey the laws of physics.

If found, please return to the Board of Studies.


FOUND: Proof that maths teachers don't understand physics.

To claim, please see disgruntled Mathematics Extension One students.

 

[bevstarrunner]

right.....

 

[cko]

ahh..... ok. go hav a lie down son

 

[Rorix]

i was hoping someone might understand what the thread is about

 

[VVoody]

I dont think anyone has a clue...including me...

 

[neo o]

Evidentally Extension 1 students understand physics as well as maths teachers.

 

[JayWalker]

im assuming there was a question in the EXT 1 maths test that violated the laws of physics?

 

[chriscity1]

That was a good joke man. Even my mother got that one!

 

[Rorix]

wow, 3u maths students have less understanding of the basic practical concepts of motion than i thought

 

[Dougie]

if i saw any q that didn't abide by physics, i think i'd find other things to blame 1st!!!

 

[sub]

mate physics isnt till next week...and i got eco to worry about...what is this thread about?

 

[Rorix]

surely you people got

x= (2 + tant)/(1- 2tant) for the v=x^2 + 1 question.

well, I ask you, what happens when t = arctan 1/2

 

[Jebu]

LOST: PARTICLE OF INFINITE SPEED. In an unfortunate mishap, the BoS released a particle which attained infinite speed after arctan 1/2 seconds. Warning: Take care when catching, the particle has infinite momentum and does not obey the laws of physics.

If found, please return to the Board of Studies.


FOUND: Proof that maths teachers don't understand physics.

To claim, please see disgruntled Mathematics Extension One students.

Very clever! I hadn't realized until i had a quick glance at the question

For anyone who didnt notice, in 5a) ii

t = arctan (x) - arctan (2)

when t is arctan (1/2) our function reaches pi/2, which is an asymtote for tan
Hence impossible

[edit: seems you posted while i was using different logic, still valid tho ]

 

[Rorix]

since it's velocity and acceleration also involve x, it's travelling at infinite speed accelerated by an infinite force.......

 

[Rorix]

note: yeah, you were right, my post was an additional comment



but when considering motion we cant really have the particle blink out of existence at t=arctan1/2 then arrive suddenly on the other side a huge distance away, so we can't say that t=/= arctan1/2....which means that our particle goes infinitly far away on the positive direction then suddenly reappears infinitly far away in the negative direction...

this quantum physics dilemma seems a bit tough for a 3u maths test!
(i dont know if its actually quantum physics, but that sounds cool)

 

[Kazuya]

eh? what's arctan? i got like inverse tan + something for 5(a)ii ... i guess that's wrong then?

and i don't think anyone cares about the validity of a question...they just want the marks...

 

[Rorix]

arctan= inverse tan yeah


and i sat puzzled for a minute or two trying to work out where i went wrong

 

[mojako]

LOL this is great...
hmm.....
maybe this particle dilates time so t will never reach arctan1/2
as an object reaches the speed of light, time will progress slower for that object.

but for this one.. speed can exceed the speed of light..
but we can try to sorta explain this
speed = distance/time
but the time slows down for the object... and for us, who observes the object from outside, the time gets very large.. so denominator is getting larger... so speed < speed of light.. hmm... I know this is not a satisfactory explanation

 

[Jebu]

Im worried i forgot my +c to tell you the truth

 

[absolution*]

total loffol/11w1w.

i got it right woot. i think.

was it arctan (.5) something artan (2)? where arctan (2) was the constant after integration?