Messages posted by Sagar Saxena

hello dear..

soap buble is bilateral.it means it is having two surfaces.......

so,due to induced charges ,there is a electrostatics force between the two layesr of soap which are attractive in nature ,hence it contarcts

heloo dear..just dont think about the result at this stage ,only and only work hard..bcoz thinking at this stage might hinder ur chances of getting sucess in the exam

electric potential energy:

it depends upon the conservative coulumb force,within the system of the charged particles:

Gravitational potential energy:

it is the energy due to the presence of other particle and its gravitational field:

other are:

1.Nuclear potential energy

2.Chemical potential energy

3.Thermal potentiak energy

hello dear..

AD gupta subjective is best when you have plenty of time but at this stage o for AD gupta MCQ..bcz exam is objective and doing objective questions will help u get in IITJEE

dude,revising one book 10 times is much better than doing ten books one time,go for ML khanna and AD gupta ....still these are the best books or iitjee

hello dear

these tangents are parellel hence distance between them will be diameter of circle and distance is 3/2

hence the radius of circle would be 3/4

Cheers....................

for basics of c++,go for yashwant kanitkar and sumita bha das..........they emphasis more on concepts and practical programing errors

hello dear..

iam suggesting the golden rules to learn for sign convention system:

sign convention is :

1.whenevr and where possible,rays of light are taken to travel from left to right

2.tranverse distance meausred from optical centre and are taken to be positive while those below it negative

3.longitudinal distance are meausred from the optical centre and are taken to be positive if in the direction of light propagation and negative if opposite to it eg,according tp our convention case

while using the sign conventionit must be kept in mind that:

1.to calculate an unknown quantity the known quantities are substitute with sin ina given formula

2.In the result sign must be interpreted as there are number of sign convention ans same sign has different meaning in dierent conventions

yes dear..

Focal length not only depend upon the radius of curvature of a lens,it also depend upon the refractive index of a substance or material.........

for mirror ,v uses f = r/2 but not for lenses while calculating the focal length of a lens

the sign convention of lens is same as of mirror.............

formula used is :

1/ v - 1/ u = 1/ f

sign convention is :

1.whenevr and where possible,rays of light are taken to travel from left to right

2.tranverse distance meausred from optical centre and are taken to be positive while those below it negative

3.longitudinal distance are meausred from the optical centre and are taken to be positive if in the direction of light propagation and negative if opposite to it eg,according tp our convention case

while using the sign conventionit must be kept in mind that:

1.to calculate an unknown quantity the known quantities are substitute with sin ina given formula

f = focal length

r = radius of curvature

f = r / 2

.....................hello dear..

point of inflection ,it is also called a inflection point..It is that point on the curve,at which the curves changes its sign from being upward opening to downward opening,it is the same point at which a curve at which the second derivative changes its sign from positive to negative or from negative to positive..

its application is mainly to find the nature of the curve ......

i have explained it,in some post ,plz check it

(49)

this is based on energy conservation one form to another

let at the lower end of circle the energy is=potential energy+kineti c energy

but at the lower end this energy only would be only kinetic energy and potential energy would be zero.and this whole kinetic energy of lower end will be convert into potential energy at upper end

now aplly the law of conservation of energy at both end.let velocity at lower end is v ,then kinetic energy at lower end will be 1/2mv²

and potential energy at ypper eng will be

mgh=mg (2l) -------------------(because block will travel 2l vertical distance where l is radius of circle)

so

1/2mv² =2mgl

after solving you will get

v= 2

Cheers................

Hello dear

both the questions are based on law of conservation of energy

(48)

here if we compress the spring then due to this compression energy will be stored in the form of potential energy

so aplly the formula and when we will release the spring this whole energy will be transfered to the block in the form of their kinetic energy

so

1/2 k x² =1/2 m v²

put all the value you will get

v=

now when block will leave the surface its vertical component of velocity will be zero and it will travel the 2m vertical distance so time taken to get the ground will be

t=root(2h/g)

here put the value you will get

t=

now for horizontal of motion

horizontal distance covered by block in this time

=v * t

solve you will get 1m

means it will travel 1m horizontal distance

Cheers............

the two circles are touching each other ..than

distnace between the centers must be equal to sum of radiii

[(a² + b² ] ^1/2 = (a² - c)^1/2 + (b² - c)^1/2

it will be:

1/ a² + 1 / b² = 1/c

hello dude...

in this type of question,when the circle are teaching each other,two possibilities arises....

1.They touch each other externally

if they touch externally than : distance between centers = sum of radiii

2. They touch each other internally

if they touch externally than : distance between centers = differnce of radiii..

apply the condition one by one and see from which condition ,given equation is obtained

Hello dear

i am agree with callz,you cant write the BITSAT-2009

Cheers...........

Hello dear

tommorow is last date ie 5 January 2009.pls hurry

for more detail visit

www.aieee.nic.in

Cheers.....................

who told you that clearling NTSE, will ensure your selection in IITJEE........are u considering NTSE a bench mark for selection in IITJEE............

work hard and concentrae for IITJEE and leave all the past achivements,they are gone.......target on coming exams

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