Messages posted by vijay kharya

hey all,

does anybody know any nice forums for c / c++ / java , like goiit / targetiit are there for entrance exams. Please reply and co-operate. i'm looking the kind for beginners / medium level... though i know some but they are slightly heavy on the coding stuff. i'll give u rates / badges wateva..... plz. help n thnx. in advance...

oops...it's CH2CH2Cl ( d one u get after protonating the alcohol

what sir suuggested is a very good method, however u can also use the following method, protonate the -OH group, by adding moist Hcl, u'll get CH3CH3Cl, use wurtz reaction, u'll get butane, then monochlorinate in presence of sunlight u'll get 2-chlorobutane, use alc. KOH , and then add Br2 water and again add alc. KOh / NaNH2 , u'll but-2-yne.

u've mistyped the question or it is wrong there can be infinite points with rational coordinates equidsatnd from ( 0 , 3^1/2) , all points in the +ve x axis ( and their images in Y-axis) are equidistant , just fix the point's abscissa as rational and u get loads of points

ans is b)

1/(x^2) + 1/(y^2) = 4/ (p^2)

1/(x^2) + 1/(y^2) = 4/ (p^2)

tan ( pi/4 + cot^-1 ( sqrt (7) ) )

use the sqrt ( 3RT /M ) one bcoz. rms depends only on the temperature , change in pressure may also apply a proportional change in density , ( which may not be accounted for) , so use the first one.

let u be the velocity of the projection of the body,

then at the point of projection the total mechanical energy of the particle is 1/2 mu^2 + mgh

let v be the velocity at lowest point then 1/2 mv^2 = 1/2 mu^2 + mgh

v^2 = u^2 +2gh

also we know that horizontal velocity remains constant , so ucos30 = vcos45,

sqrt ( u^2 +2gh) / sqrt 2 = u*sqrt(3) /2

3u^2 / 2 = u^2 +2gh ,

u =2 * sqrt(gh)

let $ be the angle it makes with horizontal

again the total velocity remains the same , and the horizontal velocity remains the same

u cos60 = v cos $

u / sqrt ( u^2 + 2gh ) * 1/2 = cos $

2*sqrt(gh) / sqrt ( 6gh) * 1/2 = cos $

cos $ = 1/ sqrt (6) ,

so initially i got wrong answer but now this one's correct :)

is the answer tan^-1 sqrt ( 5/3), might be i ma wrong , check the answer and tell then i'll post the solution

yes, neglecting air resistance

we should bubble 3 ( 4/3 , 2 , 3/2)

sry, seems i made a mistake 2 is also an option along with 4/3 (typo in 1st post) , so for eg. if a question says no. of points of discontinuity then we should bubble 3 ( 4/3 , 2 3/2)

x=3/4 is a point of discontinuity

yes , this is bcoz. while symmetrically filling the atoms / groups around a central atom/ion , the energy is lowered much more in com parison to asymmetrical distribution

yes , this is bcoz. while symmetrically filling the atoms / groups around a central atom/ion , the energy is lowered much more in com parison to asymmetrical distribution

write the full question atleast , if i remember correctly this is something related to aieee 2010 and ans was 4)

answers should be 2 and true

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