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says who

Re: 回复: Re: Preliminary Physics knowledge for the HSC? then if i were u, get ur hands on a good text book (physics contexts or jacaranda) and read through it a bit eeach day these holidays - understand the concepts, how things work, etc - and i am sure u wont regret this, although u may not...

Re: 回复: Re: Preliminary Physics knowledge for the HSC? from: 2007 HSC NOTES FROM THE MARKING CENTRE - PHYSICS (this is a document compiled by the senior markers of the HSC) one of the points they make "it is important to understand that the PRELIMNARY HSC Course is assumed knowledge for teh...

no joke, i lost sleep over this bak in January...

yeh..thanks for ur contribution mate - they just want 2 know whether its facing towards the earth or away on re entry, they know the reentry corridor... btw according to my notea, whixh i rememba thoroughly researchin cause i had the same problem, Astronauts face IN THE DIRECTION OF MOTION...

how so?

Re: 回复: Re: Rates of Change agreed.

my response is: 'just nail it'

by Sunday ull be better, took me 2 days to get over it

this got me interested in physics....Great doco

ur taking the positive square root, when u could also take the negative square root???? like saying (-1)^2=1, therefore (-1) = 1^0.5 = 1

Re: How do you feel about school been over sad....:(

cheers

i'm at a loss with that poly Q, although polynomials are my weak point, can u post full solution?

yes

I ndont think the question is TOO hard, given enough time, but it does take some serious thinking, and is certainly aimed at the top 5% of the state

is the answer: (200root3+100pi/3) m^2??? will post sol. if so

the fact that it is a rectangular garden is what makes this Q a bitch

by the way f(6) means 'sub in x=6 into f(x)', noy 'y=6' as some stoopid person previously said, and f'(2)=6 means when u sub in x=2 into f'(x), the value u get is 6, ie. teh gradient of the tangent at x=2 on the graph y=f(x) is 6

the second derivetavie, ie f''(x) determines CONCAVITY, as it determines teh RATE OF CHANGE OF THE GRADIENT OF THE TANGENT, if f''(x) >0, the curve is concave up at that point, if f''(x)<0, the curve is CONCAVE DOWN at theat point, and if f''(x)=0, it is MOST PORBABLY, and in most cases, a point...