Messages posted by tuhin_fire

seeing that u r a net user u can visit: http://jee.iitd.ac.in/

What can be the cutoff for INChO -2009?I am getting 71.5/100 and the highest (most probably) is about 80/100

What can be the cutoff for INChO -2009?I am getting 71.5/100 and the highest (most probably) is about 80/100

Yes u r rite.

Since air is fluid the momentum applied = pA(dx)v

For force differentiating with time we get = pav^2 (p= density)

Power = F.v= pav^3 which is proportional to v^3

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sine of angle A couldn't b more easier

First find out the number of moles of H2 and Co2 individually by gas law. Since mass is conserved.Use gas law with number of moles as the sum of these two.

It is actually the vector sum of pseudo force and force of gravity.

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Every year cutoff is around 170/489 approx. at jee. for gen. candidates

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For time period we have to see from frame of lift.hence pseudo force in opposite direction of lift acceleration.Hence net force becomes m(g+a) hence the result.

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MAths- Arihant -Individual books for all parts

A. dasgupta(Subjective) if available

Chemistry-Organic-Arihant, peter sykes/morrisson boyd/ i.l finar (for reference)

Inorganic-J.D. Lee , o.P. Tandon

Physical-O.P. Tandon

Physics-I.E. Irodov,D.C. Pandey for all parts of Physics

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in 2008 the weightage was about 35% of the total Chem paper.

Since pulley is light tension on each string is 10t

write force equation- 10t-20=2a for block of 2 kg after (2second only)

10t-30=3a for block 3kg after 3 secs.

Now velocity is 13m/s i think????

You should pay most of ur attention on Number Theory and geometry. I would suggest you buy/get previous years papers frm somewhere.And practice they r a real help.

Generally 2 questions r surely frm number theory and 1 frm geometry at rmo. if you solve these correctly.Then u will get thru. No doubt whatsoever.

If u read it minutely you will find mistakes. Such as in the Chapter Functional derivatives of carboxylic acid in the formation of cyanuric acid they have given the less stable tautomer as the product.there are also mistakes in the explanation of aldol condensation.

See for the entire system ,i.e, for both bodies that r colliding applying conservation of angular momentum at any suitable point will suffice.Since equal ,opposite forces act on system at same point(By Newton's third law)

However for only one body point of contact is needed.

Take out a notebook. Take a good book (Morisson Boyd).Write down the reaction mechanisms with ur own style,words etc. That is the best way.

Beware of the books by indian publishers like arihant u'll get wrong knowledge.

(a+b-c)^2 +(a+c-b)^2 + (b+c-a)^2= 3a^2 + 3b^2 + 3c^2 - 2ab-2bc-2ca -----------1st equation

ab+bc+ca---------------2nd equation

adding 2ab+2ca+2bc to both equations we get

3a^2+3b^2+3c^2------------------- 1st equation

3ab +3bc+3ca---------------2nd equation

a^2 +b^2+c^2 -ab-ac-bc = 0.5 { (a-b)^2 + (b-c)^2 + (c-a)^2} >0 for distinct a,b,c Hence a^2 + b^2 +c^2 > ab+bc+ac

As per question

3a^2 +3b^2+3c^2 > 3ab +3ac + 3bc

(a-b+c)^2 +(b+c-a)^2 + (c+a-b)^2 > ab +bc+ca

Sir , Actually the question was miswritten.

It was to compare racemization between--- CH3-CH2-S-CH2-Br and CH3CH2-CH(CH3)-I all other conditions remaining same.

Which would be allow lesser racemization if it is assumed only SN 1 reaction takes place ?

a) CH3-S-CH(CH3)-Br (in Ethoxide solution)

b) CH3-CH2-CH(CH3)-I (in presence of hydroxide ion)

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