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the test was kinda hard. made like 9 or 10 mistakes 1. didnt attempt the zw - wz question but realised how to do it at home 2. for the car question, i misread the question and did 4 cars instead of 8. i think i'll only lose 1 though. etc

i wrote the actual number in the exam, except i didnt have a calculator with me when i typed my answers. i just remembered 2^24

what was the radius? was it 3root(105)/10

would you lose a mark for leaving your answer as 15pi/96 and not simpllfying?

i got a) 3 - 2iroot3 =, 2cis (pi/3) and 2^24 b) A = 4, b=-3 and c=-1 c) (z+2i)^2 - (3i)^2 = (z-i)(z+5i) d) 2/15 e)x^2 - y^2 =< 4 I used wolfram and it said that for e) you had to shade the region outside of the curve x^2 - y^2 = 4. But i shaded the region between the curve and the asymptotes...

re: HSC Physics Marathon Archive also got 1.974 x 10^-4 m/s. edit : is planets velocity irrelevant?

thanks! but didnt u say u used the AM-GM inequality to prove that? or was that to prove the second inequality? Í

why is ab + bc + ca < 3

motion of proectile is symmetrcal, so time of max height is 3.75s and the projectile's horizontal displacement is 600m also note y velocity at max height is 0, i got an answer of 68.91m

Re: HSC 2013 2U Marathon Lol, thats what i thought at first. But the answer says it 2/11. Since you know at least one dice is definitely a 5, the total possible outcomes are : 1,5 2,5 3,5 4,5 5,5 5,6 and 5,1 5,2 5,3 5,4 5,6(dont count 5,5 again) Since only 2 outcomes are favourable the...

Re: HSC 2013 2U Marathon Two dice are rolled. You know that at least one of the dice is a 5. What is probability of getting a total of 8?

Hope its hard too. Last yrs was pretty nice. If last question is integration that'd kill most people. The by parts questions take forever.

theres no difference between the two. they would take the same amount of lines, wouldnt they?

I thought it is in 3U. Here's an example from 2001 hsc. acceleration = -4x. find x as a function of t if x=3, v = 6root3 when t=0. Wouldnt your first step be to use v (dv/dx) = -4x and integrate?

re: HSC Physics Marathon Archive yep, you got the right answer:)

re: HSC Physics Marathon Archive thats not the right answer. but you are pretty close. You might have made an error in squaring ? Also i dont see how the denominator is (4.37^2 + 3.28)

re: HSC Physics Marathon Archive This ones' from my trials: The distance to Alpha Centauri is 4.367 light years as measured from earth. using relevant calculation explain how a rocket could complete the journey from earth to alpha centauri in exactly 3.28 years. Try not to use trial and...

re: HSC Chemistry Marathon Archive AdvantageS: - The BL theory recognised the importance of the ionising role of the solvent in determining the acidic/basic character of chemicals. Hence it could explain why hydrochloric acid is strong in aqueous soln but weak when dissolved in other solvents...

Xylem: tube to transport water and dissolved inorganic ions; upward movement of water; capillary action is facilitated by the combined interaction of root pressure, adhesion/cohesion forces and a passive transpiration stream (Caused by water loss at surface of leaves); passive process (no energy...

re: HSC Physics Marathon Archive You're correct since 5.2x10^11m from jupiter is the same as 2.8x10^11 m from saturn