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Catalogs Discussion Forums -> Physical Chemistry -> To what volume of water must be added to 50 ml of 3.5 M H2SO4 in order to make 2 M H2SO4 -> Go to message
This Post 17 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

 37.5 ml

Catalogs Discussion Forums -> Electricity -> A wire of 4 ohm resistance is streched & its length inc. 0.1 times find final resistance. -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 4.84 ohm

Catalogs Discussion Forums -> Algebra -> IF a>0 then a+1/a is ___________ . -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 now see

x^2+y^2+z^2=K^2

is an equation of a sphere of radius k now for real sphere k>0 regardless of x,y,z being positive number

therefore x^2+y^2+z^2> 0

Catalogs Discussion Forums -> Algebra -> IF a>0 then a+1/a is ___________ . -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]

 @ guru dev do you mean (x^2+y^2+z^2)>=___________

 

Catalogs Discussion Forums -> Algebra -> IF a>0 then a+1/a is ___________ . -> Go to message
This Post 17 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

(a+1)/a € (1,∞)

a+(1/a)€ [2,∞)

Catalogs Discussion Forums -> Analytical Geometry -> All the three circles touch each other and the tangent. Find the radius of smaller circle -> Go to message
This Post 20 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

NOW See from dig. EF=AB=AD+GB  i.e  i.e r=4/9

 

Catalogs Discussion Forums -> Non IIT Institutes -> PLEASE HELP ME!!!!!!!!!!!!!!! I HAVE LOST MY AIEEE ADMIT CARD SOMEWHERE SO NOW WHAT SHOULD I DO -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

IS UR EXAM ON 11 MAY OR WAS IT ON 1ST MAY ......IF IT IS ON 11 MAY U CAN USE THE ONLINE ADMIT CARD AVAILABLE AND GET IT ATTESTED ON THE DAY OF EXAM ELSE IF YOU HAVE ALREADY GIVEN IT ON 1ST MAY THEN SORRY iI CAN'T HELP YOU

 

Catalogs Discussion Forums -> Algebra -> The function f : R ? R is defined f(x) = cos^2x + sin^4x. What is the range of f ? Please show th -> Go to message
This Post 17 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

 therefore Range of f is[3/4,1] 

Catalogs Discussion Forums -> Algebra -> The function f : R ? R is defined f(x) = cos^2x + sin^4x. What is the range of f ? Please show th -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 f(x)=Cos2x+sin4x =1- sin2x+ sin4x

                       Put  sin2x=t

Then

f(x)=1-t+t2

now since sin2x €[0,1] therefore t€[0,1]

therefore f(x) €[3/4,1]   since for  t€[0,1] the max & min value of f(x) are 1 & 3/4  at t=1/2 & t=1or0 respectively

Catalogs Discussion Forums -> Algebra -> If 2f(x) ? 3f(1/x) = x^2, for x ? 0, then what is the value of f(2) ? -> Go to message
This Post 10 points    (Olaaa!! Perrrfect answer.   in 2 votes )   [?]

pls re type ur ques I guess u used wrong symbols?

Catalogs Discussion Forums -> Algebra -> If f(x) = cos(log x), then what is the value of f(x)f(4) - 1/2{f(x/4) + f(4x)} ? Please show the cal -> Go to message
This Post 20 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

f(x)f(4) =cos(logx)*cos(log4)

            =cos(logx)*cos(log4)*2/2

            = { cos(logx+log4)+cos(logx-log4) }/2

{since    2cos(a)cos(b)=cos(a+b)+cos(a-b)}

={cos(log4x)+cos(log(x/4))}/2

{since logb(xy) = logbx + logby.  and  logb(x/y) = logbx - logby.}

={f(4x)+f(x/4)}/2---------------------------------------------------------------(1)

therefore

f(x)f(4) - 1/2{f(x/4) + f(4x)}=0                                              [from(1)]

 

Catalogs Discussion Forums -> Algebra -> What is the range of f(x) = cos[x], for - pi /2 < x < pi/2 ? please show the calculation. -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 range={cos(2),cos(1),1}

Catalogs Discussion Forums -> Mechanics -> Two particles are executing SHM of same amplitude `A` and frequency`w`along x-axis. Their mean posit -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 see, acc. to the ques the max seperation b/w the to particles is D+A  i.e when 1 particle is at max. amplitude the other must be at mean position.

THAT WHEN ONE HAS ZERO DISPLACEMENT THE OTHER MUST HAVE MAX DISPLACEMENT SO CLEARLY THE PHASE DIFF. MUST BE  

Catalogs Discussion Forums -> Parent Discussion Board -> there are so many students with same marks in IIT then how is ranking concluded ? -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 The tie-break criterion in the CML and category lists adopted for awarding ranks to the candidates who have scored the same aggregate marks is as follows:
For each subject, the average marks will be calculated on the basis of the marks obtained by those candidates who have scored more than or equal to MQMR in that subject.
Among the candidates having the same aggregate marks, a candidate will be ranked higher than the rest, if he/she has scored higher marks in the subject having the lowest average marks calculated as above. If there is a tie after this procedure, then the marks obtained by the tied candidates in the subject with the second-lowest average marks will be considered, and the above procedure will be repeated. Candidates tied even after this procedure will be given the same rank.

Catalogs Discussion Forums -> Physical Chemistry -> is the oxidation num in oxygen peroxy group -1/2??? if it is then what is oxidation of p in KH2PO2 -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 THE STRUCTURE OF KH2PO2 is 

therefore the O.s of P is +1

while the peroxygroup the os is -1 because in this two OXYGEN atoms share a charge of -2 

 

 

Catalogs Discussion Forums -> Mechanics -> Two particles are executing SHM of same amplitude `A` and frequency`w`along x-axis. Their mean posit -> Go to message
This Post 17 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

 

Catalogs Discussion Forums -> Thermal Physics -> Three perfect gases at absolute temperatures T1,T2 and T3 are mixed. The mases of the molecules are -> Go to message
This Post 17 points    (Olaaa!! Perrrfect answer.   in 4 votes )   [?]

 (n1T1+ n2T2+ n3T3)/( n1+ n2+n3)

Catalogs Discussion Forums -> Algebra -> If cube roots of unity are 1,w,w^2, then prove that: (x-y)(xw-y)(xw^2-y)=x^3-y^3 -> Go to message
This Post 15 points    (Olaaa!! Perrrfect answer.   in 3 votes )   [?]

 (x-y)(xw-y)(xw2 -y)=x3 (1-y/x)(w-y/x)(w2 –y/x)                                         _______(1)

Now if 1,w,w2 are roots of equation k3 -1=0

Then

k3 -1 =(k-1)(k-w)(k-w2)

now if k=y/x

then  (y/x-1)(y/x-w)(y/x- w2)     =  - (1-y/x)(w-y/x)(w2 –y/x)  =  (y/x)3-1      

=>      (1-y/x)(w-y/x)(w2 –y/x) = 1-(y/x)3

then eqn (1) becomes

x3 (1-(y/x)3)       =x3-y3                   

 
 
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