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top: mathematics extension 1 worst: english advanced

i did rutherford and bohr, i explained both of their models and explained how their models allowed other scientists to gain an insight and add their own ideas resulting in the development of the atomic structure. then i drew a flowchart of the development of the atomic model from gallileo to the...

i thought the 3u paper was considerably easier than 4u. hoping for an 80/84 in 3u, considering i didn't make any silly mistakes. but i'm prob only get 85-90/120 in 4u. so yupp.

yay. 80/84.

ya, i think you're correct, i just re-did it. sigh. stupid minus signs.

how did u get pi/3 and 5pi/3. i got the quadratic with cos and then when i factorised it i got (2cos+1)(cos-1), then cos=-1/2 so, the angle should be 2pi/3, 4pi/3 right? i dunno. maybe i stuffed up earlier.

not too sure, maybe but prob not. if u did some logical working, u might get 1. so fingers crossed.

(x-3)(5-x) must always be positive, cause you can't log a negative number. hence, u solve by inequalities: x-3>0 or 5-x>0 x>3 or x<5 when u solve it, u should get 3<x<5

but i didn't do it by implicit diff, i just did normal differentiation coz the tan of the angle at the point was the vertical velocity/horizontal velocity. so ya. i wouldn't how else to do it.

i'll put the other answers i got, not proofs though, they are too long: 3(a)(ii): -2=<x=<4/3 4(a)(ii): 12.44pm 4(b)(i): 7!= 5040 ways 5(a)(ii): y= 1-(1-2x)^1/2 5(a)(iii): 1/2 5(b): a=2/3 metres T=2pi/3 seconds 6(a)(ii): 96.0m 6(b): 0, 2pi/3, pi, 4pi/3, 2pi 6(c)(i): (p+q)!/(p!q!) 6(c)(ii)...

LHS= y'(t1)/x'(t1) =(Vsin-gt1)/Vcos RHS=tan a - tan b =h(t2-t1)/Vt1t2cos sub t2= 2Vsin/g - t1 and t1t2= 2h/g therefore: RHS= h (2Vsin/g -2t1)/V(2h/g)cos =(Vsin-gt1)/Vcos =LHS

i got that too, i think its correct

i can try: 1(a) : -27 1(b): -3/(1-9x^2)^1/2 1(c): pi/3 1(d): 10264320 1(e): ((2)^1/2)/12 1(f): 3<x<5 2(a): 1/2 2(b): (11)^1/2 2(c): -5 2(d): 4.11

Re: How did you guys go? i thought it was alright, it was hard but do-able. the hardest was prob the race car question, besides that i managed to do the rest.

1-15 2-15 3-13 4-8 5-14 6-11 7-7 8-7 stupid circle stuff screwed me over.

i thought questions 4 and 8 were the worst. question 6 wasn't that bad, prob got about 10 or 11.