|

 Vijay Pal's messages in the community 1 2 3 ... 121 122 123 GO Go to Page...
Message
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

f(x)=x-1/x+1

f(ax)=(ax-1)/(ax+1)

now af(x)-ax-a/ax+a

(ax+a)afx=ax-a

ax(af(x)-1)=-a-a^2f(x)

ax=(1-af(x))/(f(x)-1/a)

now f(ax)=(1-af(x))/(f(x)-1/a)-1)/((1-af(x))/(f(x)-1/a)+1)

=(1-af(x)-f(x)+1/a)/(1-af(x)+f(x)-1/a)

=(a-a^2f(x)-af(x)+1)/(a-a^2f(x)+af(x)-1)

=(a+1)(1-af(x))/(a-1)(1-af(x))

=a+1/a-1

hence none of these is correct

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear yes it is posible to differentiate onto function

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

halogens have only  one empty orbital in thier p shell, hence can only acquire 1 negative charge, and not two

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

i^i=0.20708

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

it is -2e^(1/4(pi-2x)|2)

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear ,

no it's not true nitrogen do not have lowest ionisation enthalpy, infact it's very stable.

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

net change in velocity = vf-vi=-v-(v)/t

-2v/(pi*r/v)=-2v^2/pi*r

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

first we wil calculate net displacement between t=2 to t=6s

Sx=Uxt+0.5at^2

since ax=0

hence Sx(2)=80cos30*2=80*sqrt(3)

sy=80sin30*2-5*4=60

now Sx(6)=240sqrt(3)

Sy(6)=-100

delta S= 160(3)^1/2i -40j

magnitude=280

average velocity=280/4=70m/s

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

the line parallel to x-2y=1 must have a slope of 1/2

hence

2(5-y)=3-x

-2y+x=-7

now intersection of this line with given line 2x+3y=14

x=1,y=4

distance = ((3-1)^2+(5-4)^2)^1/2=sqrt(5) units

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

let the intensity at distance r is to be calculated

then intensity = power/area

now total surface area = 4pi*r^2

hence I=P/4pir^3

since all other things are constant for a source, only variable is r term hence,

I is inversely propotional to (distance)^2

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

a unit less quantity is one which has been assigned no unit, just a number , and a dimensionless quantity is one which has a dimension of 1 in other words, with out any dimensions like mass length or time etc.

dimension less=reynolds number

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

sin40*sin50+cos40cos50=0

this is the formulat for cos(a+b)

where a=40, b=50

hence the equation becomes cos(40+50)=cos90=0 , hence proved

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hell dear

the value of sin(infinity) lies between -1 to 1 but it can not be determined exactlly

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

V1=200v , positive

v2=200-(200/15)*5=133.33 V , positive

v3=0

V3-2=133.33v ,negative

V1-2=66.67v, positive

v1-3=200v, positive

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

equation of a circle with center known is given by

(x-Xo)^2+(y-Yo)^2=r^2

(x+2)^2+(y-4)^2=r^2

now as u have not mentioned the point from where it passes, radius of circle can not be calculated if u know the point then

r^2=(Xo-x1)^2+(Yo-y1)^2

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

to factorise this we need to find common term multiplied to these terms

now

x^2-y^2+yx^2-xy^2=(x+y)(x-y)+xy(x-y)=(x-y)(x+y+xy)

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

potential difference is the energy difference per unit entity. between two points.

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

covalency is 4 as there are 4 electrons shared between O and N atoms

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear 4th is wrong

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

hello dear

mole is a unit that is used to express quantity /number of same entity

1mole = 6.023*10^23 atom/molecules

usually we use moles of atoms or molecules to calculate the amount of substance required in a reaction.

for example

a+2B--> 3C +4D

then it means

1 mole of a reacts with 2 mole of b to give 3 moles of c and 4 moles of d

1 mole of a substance has same weight numerically as in amu units, but in grams. for example

molecular mass of O2=32 amu

and molar mass of O2=32g

 1 2 3 ... 121 122 123 GO Go to Page...
 Go to:  Select a forum   Board Exams - CBSE, ICSE, State Boards   Course Material   Computer Science   Physics   General Physics   Mechanics   Optics   Thermal Physics   Electricity   Magnetism   Modern Physics   Mathematics   Algebra   Trignometry   Analytical Geometry   Differential Calculus   Integral Calculus   Vectors   Chemistry   Physical Chemistry   Organic Chemistry   Inorganic Chemistry   Institutes & Courses   Coaching Institutes & Course Material   About IITs and JEE   Non IIT Institutes   Counselling Zone   Parents Corner   Parent Discussion Board   Biology (for Medical Entrance)   Botany   Zoology   Fun Zone   Lounge   Games, Puzzles and Quizzes   General Knowledge

Name

Mobile

E-mail

City

Class