IIT JEE , AIEEE Forum - Physics , General

punnima

E _ind (between centre and circumference of circle traced by a rod of lenth R rotating at

rad/s in a uniform magnetic field B going into plane of paper)

=1 B R²

2

punnima

solubility product of a reacn

A_xB_y =xA^y+ +yB^x-

of solubilty 's' is given by:

^{is :}K_sp⁼x^xy^ys^x+y

hardcore_genius

in G.P.

T_N= a*r^n-1

where, a= first term

r = common ratio

racerix

Activity of radioactive substance

R =

N = 0.693/T_1/2=

N₀e^-t = R₀e^-t

racerix

Speed of Light

In Vaccum

c = 1/(

₀

₀)^1/2 = E₀/B₀

In a Medium

v = 1/(

)^1/2= 1/(K

₀

_r)^1/2= c/(K

_r)^1/2= E/B

nitigya

C_V= R/(

-1)

C_P= (R*(gamma))/(gamma-1)

Rahul_bhalerao001

elevation in boiling point=i *K*m
how was it?

akhil_o

Self Energ of a uniformly charged sphere

U=3/5[Q²/4

R]

Self Energ of a uniformly charged hollow sphere

U=1/2[Q²/4

R]

apoorva_43

BEHAVIOUR OF GASES

1. P=dRT/M , d=density of gas

2. avg KE per molecule of an ideal gas=3/2 KT .K=boltzmann's const.

3. most probable velocity : mean velocity : RMS velocity= 1 : 1.128 : 1.225

punnima

for calculation of order of reaction from two half lives:

n=[log(T_1/2)₁-log(T_1/2)₂]/( log a₂- log a₁)

where a2 and a1 are two different initial concentrations and t1/2 their resp. half lives

punnima

relation between Y,n,B,

Y =2n(1+)

Y=3B(1-2)

where Y:young's modulus

n:shear modulus

B:bulk modulus

:poisson's ratio

crack

hey people you are suppose to rate

f=gMm/r^2

s=ut+1/2at^2

Avinash_Bhat

KINEMATICS - One Dimensional - I

1. v = u + at

2. S = ut + (at²)/ 2

3. v²   = u² + 2aS

4. 2S = t(u + v)

5. S_n = u + a(2n - 1)/ 2

6. Equal 'n' distances travelled with speeds : v₁ , v₂ , v₃ ................ v_n . Then average speed ' v ' is such that :

                                           n / v = 1 / v₁ + 1 / v₂ + 1 / v₃ + .............. + 1 / v_n

7. Equal 'n' time intervals covered with speeds : v₁ , v₂ , v₃ ................. v_n. Then average speed ' v ' is such that :

                                       v = (v₁ + v₂ + v₃ + ...................... + v_n) / n

8. Consider this situation : A body is dropped from a height 'h' so that it reaches the ground in time 't' with a final velocity of 'u'. Then :

(a) h = u² / 2g => u =

( 2gh )

(b) h = t²g / 2 => t =

( 2h / g)

(c) t = u / g

***At a distance of ( h / n ) from the top : velocity = u /

n

: time = t /

n

***At time ( t / n ) : velocity = u / n

                           : distance from top = h / n²

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