IIT JEE , AIEEE Forum - Physics , General

pratikanand

if z is real ... then

z+z' = 2Re(z)

if z is imaginary...then

z-z' = 2Im(z)

read z' as z(bar)

nikita19

arg _
(z ) +arg (-z)=pi if arg(z)<0
-pi if arg (z)>0
where z represents a complex no.

hardcore_genius

Gud going friends,
But as i can see sum of u are not giving the points, plz donate 2 points , so as to keep on the craze of posting a formula.
Cheers!!!

P (optical power) = 1/f (focal length in meters)

racerix

I=E/(R+r)

I: Current thru circuit
E: EMF of Cell
V: Potential Diff. across cell
R: Resistance given by circuit
r: Internal resistance of cell

siddharthsaxena

how about ;

P(B/A) = P (A^B) / P(A)

For conditional probablity

punnima

d/dx { _{[ f(x)]}

^{[ g(x)]} F(x) dx} =F(g(x)).g'(x)-F(f(x)).f'(x)

aquafina_1991

1st law in thermodynamics

Q=U+W

Q=heat supplied/released in J

U=internal energy of the system dependent on temp.

W=work done on/by the system

kundan_leo

allrit......
how about PASCAL'S LAW......for fluid pressure

P =

g(

h)

= fluid density

h = height

g = acc due to gravity

vivsarda

slope of tangent to the curve is dy/dx at the point...

learner

Lift problems: Apparent weight = M(g ± a0)

(+ sign is used when lift is moving up while . sign when lift is moving down)

gain

Magnitudes in circular motion

Fc=ma=mv^2/r=rw^2

v=rw=2pier/T

w=2(pie)f=2 pie/T

f=1/T

AJ1991

very helpful formula:

general formula for (1-x)^{-r_{= (N+R-1)C(r) X (x}r)}

deeplove

Its a good practice but I think if u r discussing formulas, u better prepare for AIEEE or others. Discuss problems. Concentrate on them the formulas will be prepared automatically..

Sorry guys if im weired.

hardcore_genius

Yes, i know that it will prepare for AIEEE but u cn't crack JEE without knowing the basic formulae.

stress = applied force / area on which force is applied

s = F/ A

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