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Mathematics: Post your doubts here!
da/dt = KV da/dt = k(4/3πr^3) da/dt = 4/3πkr^3 A=4πr^2 V = 4/3πr^3 da/dr = 8πr dv/dr = 4πr^3 dr/dt = dr/da x da/dt dr/dt = (1/8πr) x 4/3πkr^3 substitute r and dr/dt to find K then u will end up with the given equation did u get it ? -
Mathematics: Post your doubts here!
oh that shows how to get it, thank you :) -
Mathematics: Post your doubts here!
sin 3x + 2cos 3x = 0 divid the equation by cos x and u will get tan 3x +2 = 0 tan 3x = -2 3x = -64.3 and 116.5 x= 158.9 and 38.9 but i have no idea how the mark scheme got 98.9 as one of x values sorry :/ -
Mathematics: Post your doubts here!
mechanics is always better than stats..stats EWWWWWWWWWWWWWW -
Mathematics: Post your doubts here!
take something less than 90 degrees (1/2pi) because logically the angle looks smaller than 90 degrees i would say start with 1.5 -
Mathematics: Post your doubts here!
thanks man that really helped! -
Mathematics: Post your doubts here!
got bored of solving them and you finish before time by 45 mins means you r well prepared..am i wrong ? -
Mathematics: Post your doubts here!
maybe do past papers? ever heard of that? :P -
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Hardest Chemistry MCQs ever.
it doesn't matter. if you look at the equations of these 3 they all produce DH3..idk why CIE is confusing us..whats the point of that "D" they can just make it look normal with the N -___- -
Mathematics: Post your doubts here!
i need help with question 6(ii) may june 2009 paper 3 http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s09_qp_3.pdf -
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Chemistry: Post your doubts here!
reaction one is written "reaction 1" in bold..wakie wakie i think u didn't sleep much :P its from W -------> Z -
Chemistry: Post your doubts here!
i think it mattters with the conditions only..but you will have the same product. i also think its faster with KCN than with HCN -
Chemistry: Post your doubts here!
the reaction is called hydrolysis of nitriles (this is in acidic conditions) product: carboxylic acid and ammonium salt of sulphate -
Chemistry: Post your doubts here!
no you are wrong, if X is heated under reflux then complete oxidation will happen and instead of an aldehyde formed you will have a carboxylic acid formed and carboxylic acids do not give positive results with 2,4- dinitrophenylhydrazine. i am sorry but i really don't know what are cleavage... -
Mathematics: Post your doubts here!
hey..i need help with the last part of question 10 (b) i know how to sketch it and shade it but i cant find the max arg of z http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w11_qp_32.pdf -
Mathematics: Post your doubts here!
this question is a nightmare to me..came in my exam and i ran out of time thinkin of it and it turned out to be a pretty stupid tricky question -_-