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Mmm.. just wondering where did i go wrong?

i'll post a Q if my ans is rite. Got so confused while doing it...

How did u study for it? share some tips...

Honestly i never liked chem. i was planning to drop chem in term 3 prelim cuz i bludge through chem in year 11. My friends insisted tat i should continue so i began to take it seriously in term 4 start of HSC, and my marks improved heaps since.

please show that : nC1+nC3+nC5+... = 2^(n-1)

Sorry for bothering, but if i could get a rought prediction that would be great. Thanks in advance! My cssa trial marks n ranks: 2U maths: 90% rank 1/68 Maths ext1: 87% rank 5/30 esl english: 80% rank 4/32 Economics: 90% rank 5/16 Physics: 90% rank 3/32 Chemistry...

cath trials maths 2u: 90 rank 1 maths 3u: 87 rank 5 physics : 90 rank 3 chem : 92 what a fluke.. ranking not sure prob 4 or 5 esl english: 80 ranking not sure eco :90 i rckn a fluke as well. rank 5 is uai 93 achievable?

wow, it works perfectly, thanx a lot! I think by expanding (1+x)^n and substitute x=1, would be easier to prove []=2^n btw, which topic is "Gauss method" from? I don't seem to remember ...

I need help with this question: The coefficient of x<SUP>k</SUP> in (1 + x)<SUP>n</SUP>, where n is a positive integer, is denoted by<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> C<SUB>k</SUB> (so C<SUB>k</SUB> = <SUP>n</SUP>C<SUB>k</SUB>)<o:p></o:p>...

is it 21.2m/s at 45 deg ? if g=10

a) a=8x(x<SUP>2</SUP>+1) v<SUP>2</SUP>=2∫a dx = 2∫4*2x(x<SUP>2</SUP>+1) dx move 4 out = 8[1/2(x<SUP>2</SUP>+1)<SUP>2</SUP>]+C v<SUP>2</SUP>=4(x<SUP>2</SUP>+1)<SUP>2</SUP> + C (v=2 , x=0 therefore C=0) so v=2(x<SUP>2</SUP>+1) c) x=tan2t v=2sec<SUP>2</SUP> 2t t=pi/8 v=4 m/s or...

Another sample question (with working) has similar question with the one i posted above, but with diff. numbers, that's all. A particle is moving with SMH starts from rest at a distance 6 m from the center of oscillation. if the period is 4pi , find the velocity and acceleration when it's 3 m...

thanx. but, i got to that step as well, however the book's answer for velocity is negative root 5, which confuses me.. Does it mean its travelling in another direction?? i kept having trouble with the direction for velocity in SHM u noe..

i'm having trouble with this question. plz help thanx! a particle moving with SHM starts from rest at a distance 3m from centre of oscillation. If the period is 2pi seconds: find the velocity and acceleration when it is 2 m from the origin. ans: - √5 m/s , -2m/s<SUP>2</SUP>

I'm confused with solving SHM questions, please help.. thanks. <?XML:NAMESPACE PREFIX = O /><O:p></O:p> A particle moving with SHM starts from rest at a distance 6m from the centre of oscillation. If the period is 4pi seconds: a) find the time taken to move to a point <?xml:namespace prefix =...

How to prepare an essay that can be adapted into exam questions? What's the trick?

Sin-1 (-x) = - sin-1(x) so: sin-1 (-root3/2) = - sin-1 (root3/2) = -pi/3

hey i don't think your working is right can't understand