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Chemistry: Post your doubts here!
Is my enthalpy cycle for Q12 correct? If it is, how do I calculate the enthalpy change of combustion now? -
Physics: Post your doubts here!
which one is the recent edition? any idea? -
A' Level Registrations for May/June 2016
just called British Council...said the same thing to me 'payment confirmation is the provisional statement of entry this time' the official statement of entry will be received two weeks before exams but how did that person get it then? -
REDSPOT A LEVEL CHEMISTRY
I have that book and I can scan it if u wish but believe me this book is just no use except the first few topics. It's old and contains questions which are no longer part of AS syllabus so all that book does it to make you feel like a dummy! like you know nothing! and I would just dive into... -
Physics: Post your doubts here!
Which book should I chose for Physics? -
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Statistical Inference
Question 22: μ=38.3 , σ=7.5 a) Z<30 : Z(30)= (30-38.3)/7.5 = -1.106 prob at 1.106: 0.8643 1-0.8643 =0.135 or 13.5% b) Z(35) Z(35)= (35-38.3)/7.5 = -0.44 prob at 0.44: 0.6700 1-0.6700 = 0.33 Z(30) we alrady found so between 30 and 35: 0.33-0.135 = 0.195 or 19.5%... -
Statistical Inference
Question 21: μ=15 , σ=3.5 a) Z>20 : Z(20)= (20-15)/3.5 = 1.42 from the table: 0.9222 1-0.9222 =0.078 b) Z<20 we already found that in previous part : 0.9222 c) Z(10)= (10-15)/3.5 = -1.42 1.42 is 0.9222 from the table 1-0.9222 =0.078 Z(12) = 12-15/3.5 = -0.85 prob from the... -
Statistical Inference
Question 20: μ=29 , σ=5 a) Z(30) = (30-29)/5 = 0.2 from the table: 0.5793 Z(34) = (34-29)/5 = 1 from the table: 0.8413 30>Z>35 : 0.8413 - 0.5793 = 0.262 b) At least 23 million means Z >23 Z(23) = (23-29)/5 = -1.2 from the table: 0.8849... -
Statistical Inference
Question 19: μ=2708, σ=650 a) Z(3000) = (3000-2708)/650 = 0.4492 from the table: 0.4492: 0.6736 1-0.6736 = 0.326 For percentage, just multiply the probability by 100 0.326 will be 32.6% b) We already found Z(3000) in the previous part, so, Z(3500) = (3500-2708)/650 = 1.21 1.21 from the... -
Statistical Inference
Q18: μ=80, σ=14 a) Z(75) = (75-80)/14 = -0.36 from the table: 0.36: 0.6406 1-0.6406 = 0.36 Z(90) =... -
Statistical Inference
Q17: μ=50, σ=4 a) Z(44) = (44-50)/4 = -1.5 Z(55) = (55-50)/4 = 1.25 From the table, 1.5 is 0.9332 so 1-0.9332 = 0.0668 1.25 is 0.8944 44<Z<55 : 0.8944-0.0668 =0.8275 b) Z(55) as calculated above: 1- z(55) = 1-0.8944 =0.1056 c) Z(52) = (52-50)/4... -
Islam began as a something strange and it will return to being strange, so blessed are the strangers
Islam began as a something strange and it will return to being strange, so blessed are the strangers- Eugene99
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Chemistry: Post your doubts here!
Got it! Actually I didn't convert kPa into Pa, that made my answer wrong Mr is 15 not 16 which means we get exactly 3.2, no need to round off:P thank you -
Chemistry: Post your doubts here!
ans is D but I get 0.003 or something...help! -
A level Biology: Post your doubts here!
It's okay! :p we all make mistakes, we are all humans...but those CIE guys who make Paper 1 never seem to realize that! When each option shouts at me 'i'm correct', then my human characteristics fail to justify :D -
A level Biology: Post your doubts here!
Yes thanks for pointing out. You are right about the codons thing but about the large subunit, my book says 'the mRNA binds to the small subunit' ain't it so? -
A level Biology: Post your doubts here!
How is this? It covers the first 8 points though. Translation takes place, making use of nucleotides to make amino acid chains. The mRNA moves towards the ribosome and binds itself with the small subunit of ribosome. A tRNA molecule, which has a specific amino acid, with three exposed bases... -
A level Biology: Post your doubts here!
Why is the answer B? 0.2 mm is 200 nm, why wouldn't it be visible under 220 resolution? and how are A, C and D incorrect? -
A level Biology: Post your doubts here!
YESSS I get that. thank you! I thought T from strand 1 was going to pair with A from strand 1! silly me! how can it pair with itself? :P that caused all the problem!