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General Physics

Blazing goIITian

Joined:	22 Jan 2008
Post:	423

26 Jan 2008 20:06:04 IST

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135

10329

Hey guys! Let's start a great game ......

None

Every person who views this message has to write two formulaes for iitjee-08or-09...

The next persons who views this will give a perfect rating to the person if he likes the formulae.

Then of course if he wants some rates,he too should write two formulae.

Note:plz do not give ratings to ppl who do not write any formula.......

This way everyone will gain rates..

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Ronde vous Silvouz plait

Blazing goIITian

Joined: 22 Jan 2008

Posts: 423

26 Jan 2008 20:08:42 IST

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the first two formulae are:

1.dQ=dU+dW

2.Q=mcdt...

Ronde vous Silvouz plait

Blazing goIITian

Joined: 22 Jan 2008

Posts: 423

26 Jan 2008 20:12:45 IST

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hey everyone,...

Ashwin R

Blazing goIITian

Joined: 27 Dec 2007

Posts: 324

26 Jan 2008 22:35:39 IST

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P+1/2* density* v^2+density*g*h=constant |bernolli's theorem|

h=2S/p*g*a |capillary rise

Akshay

Blazing goIITian

Joined: 27 Dec 2007

Posts: 689

26 Jan 2008 22:57:35 IST

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1.Velocity of an electron in a Bohr orbit

=2.18 X Z/n X 10^8 cm/s

where:Z=atomic number

n=no. of orbit

2. Radius of a bohr atom:

0.529 X n^2/Z Angstrom units

Where n and Z have the same meaning as in the first case...

$^Mujtaba^$

Blazing goIITian

Joined: 15 Nov 2007

Posts: 436

27 Jan 2008 22:48:56 IST

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If heat energy is supplied to a gas of mass m at constant volume, heat energy supplied is given by:

dQ= m.c_v.dT
where,
c_v= specific heat at constant volume when mass =m

If heat is supplied to n moles of the gas for the same condition then heat energy supplied is given by:

dQ= n.C_v.dT
where,
C_v=specific heat at constant volume when moles=n

saket

Scorching goIITian

Joined: 30 Dec 2007

Posts: 203

30 Jan 2008 20:01:53 IST

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the most important of all..............

force=mass * acceleration

Rohan

Blazing goIITian

Joined: 3 Jun 2007

Posts: 696

30 Jan 2008 20:17:45 IST

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1.distance=speed*time (too...difficult)

Ronde vous Silvouz plait

Blazing goIITian

Joined: 22 Jan 2008

Posts: 423

12 Jul 2008 18:33:25 IST

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Hey guys remember to vote for the person with maximum pts.

formulae:

E=-dv/dr....

F=I.dlXB...

®µD®A

Blazing goIITian

Joined: 12 Apr 2008

Posts: 2717

12 Jul 2008 18:41:38 IST

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$\text{Energy stored in capacitor or inductor: } U_c=\frac{1Q^2}{2c}\ \ \ \ U_l=\frac{1}{2}LI^2\\\\\text{Oscillating frequency of LC circuit:}\left(2\pi f \right)^2=\frac{1}{LC}$

krish1092

Blazing goIITian

Joined: 4 Jul 2008

Posts: 392

12 Jul 2008 18:59:20 IST

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Orbital velocity V₀=R

Escape velocity V_e =

®µD®A

Blazing goIITian

Joined: 12 Apr 2008

Posts: 2717

12 Jul 2008 19:01:35 IST

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$\text{Reactants of capacitor and inductor(AC)}\\X_C=\frac{1}{2 \pi fl}\\\\\text{f is the frequency}\\\\\\\text{Impedance of LRC circuits(AC):}\\\\Z=\sqrt{(X_C-X_L)^2+R^2}$

pk kc

Hot goIITian

Joined: 2 May 2008

Posts: 185

12 Jul 2008 22:22:49 IST

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1) K =2.303/T *LOG a/a-x

2)AVERAGE LIFE =HALF LIFE PERIOD/0.693 =1.44*HALF LIFE PERIOD

kislay kumar

Blazing goIITian

Joined: 7 Mar 2007

Posts: 784

12 Jul 2008 22:46:53 IST

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Area of the triangle made by the line ax+by+c=0 and the co ordinate axes is c²/(2ab)

kislay kumar

Blazing goIITian

Joined: 7 Mar 2007

Posts: 784

12 Jul 2008 22:47:26 IST

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no. of ways in which n identical things can be distributed into r different groups is ^{n+r -1}C_{r -1} if blanks are admissible and ^{n -1}C_{r -1} if blanks are not admissible

kislay kumar

Blazing goIITian

Joined: 7 Mar 2007

Posts: 784

12 Jul 2008 22:48:55 IST

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The area bounded by y²=4ax and its latus rectum x=a is 8a²/3

kislay kumar

Blazing goIITian

Joined: 7 Mar 2007

Posts: 784

12 Jul 2008 22:49:11 IST

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The area bounded by y²=4ax andx²=4by is given by (4a)(4b)/3

kislay kumar

Blazing goIITian

Joined: 7 Mar 2007

Posts: 784

12 Jul 2008 22:49:42 IST

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The image or reflection of the point (x₁,y₁) in the line ax+by+c=0 is (h,k) where

(h-x₁)/a=(k-y₁)/b= -2(ax₁+by₁+c)/(a²+b²)

Arshdeep Singh Malhan

Blazing goIITian

Joined: 14 Aug 2007

Posts: 910

12 Jul 2008 22:49:51 IST

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1.integral of tanxdx=log [secx]

2.integral of secxdx=log[secx+tanx]

3.integral of cosecxdx=log[cosecx-cotx]

kislay kumar

Blazing goIITian

Joined: 7 Mar 2007

Posts: 784

12 Jul 2008 22:52:57 IST

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In any triangle ABC,

tan((B-C)/2) = (cotA/2)*(b-c)/(b+c)

Similarly,

tan(A-B)/2 = (cot(C/2)*(a-b)/(a+b)

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