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can some one explain me how 0! is 1 not 0..........???????????
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ur right.............i'm finding it a little bit tuf........
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1. Any by wave equation which is of the form y = f ( t - kx ) represents a
progressive wave :
a. If the sign of t and x are opposite, wave is propagating along positive x-axis.
b. If the sign of t and x is same , wave is propagating along negative x-axis
c. If t - kx = phase = constant, then the shape of the wave remains constant.
d. For a given t, y-x graph gives the shaoe of pulse or string.
e. Wave speed , c = / k.
f. Particle velocity, v = slope =  y / t.
2. Total energy of a loop remains constant.
3. The particle of medium at node remains permanently at rest. Also nodes divide the medium into loops.All particles of a medium lying in a loop vibrate in the same phase having different amplitude.
4. At node displacement is zero but pressure is maximum and at antinode displacement is maximum but pressure is minimum.
5. For a given t,the y-x graph gives the shape of the string.
6. If the strings vibrates in 'p' loops. pth harmonic is produced then the frequency of pth harmonic is
fp = p / 2l  ( T / m ) .
7. If a string is vibrating in nth mode of vibration,then
a.number of harmonics = n
b. number of loops = n
c. number of nodes = n+1
d. number of antinodes = n
e. number of overtones = n -1
8. The meaning of octave is 2, eg- if f2 is nth octave higher than f1 , then
f2 = 2n f1
9. The amplitude of the reflected wave is [ (c2 - c1 ) / (c1 + c2 ) ]Ai and the
amplitude of transmitted wave is At = Ai [ 2c2 / (c1 + c2 )].
Ai = amplitude of incident wave in first medium
c1 = speed of wave in first medium
c2 = speed of wave in second medium
10. Melde's law : p T = constant
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can someone help me in preparing timetable
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three blocks placed on each other .....friction is present in all surfaces......
case 1: force f is applied on the first block
case 2: force f is applied on the second block
case 3: force f is applied on the third block
i want the fbd of this system for all three cases
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If you have absolutely no idea what the answer is........and if u hav some idea about the concept.....then the following can useful........
1.If one the answer is substantially longer,it could be the right answer?
2.If there are two exact opposites the answer could be one of the two.
3.Statements that are ardent and use definitive words, such as "always ",
"all","must","every time","none","never", are usually false.
4.Statements that have language, such as "usually","most often","likely","probably","could","might","should", and "rarely",are always true
5.If two answers sound alike,choose one of them.
6.If two numbers differ only by decimal ponit(and others are not close ) choose one of them..ex- 2.3,6,1.5,15 we can either choose 1.5 or 15.
7.When u don't know the right answer , look for the wrong one to eliminate options.
8.If u are supposed to read a passage and answer questions about it, read the question first.That will tell you what you're looking for...
NOTE-always remember a guess is a guess.
don't always try it...apply it where ever necessary
SOURCE----- SURE-FIRE TIPS TO CRACK EXAMS
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not able to memorize all the organic reactions ....is it necessary to know all of them ...............plzzzz do mention very important ones that i need to be thorough.........
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sir ,
i'm not able to memorize most organic reactions.............is it necessary to know all the reactions .........plzzzzz do mention the important ones. ............and in general mention all the important topics also.....
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http://www.cbsenotes.com/
go to dis site.
n den..
click the sample paper.
wid every sample paper..der are value points of every ans in the end of each sample paper.................................rate me if ur satisfied.....
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is the correspondence tests of fiitjee & all india test series of fiitjee is one and the same
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i'm planning to take fitjee test series.......when is it gonna start.............and wats the difference between all india test series ..and..mock test series.....
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rate the following article if found useful and do pass ur comments:-
1.When a pendulum is kept in a car which is sliding down, then
T= 2 [L / gcos  ] where is angle of inclination.
2.if a simple pendulum oscillates in a non-viscous liquid of density  ,then its time
period is T=2 [ L / ( 1 - /  ) ].
3.If the mass m attached to a spring oscillates in a non-viscous liquid of density ,
then its time period is given by T= 2  [ m/k (1- / ) ].=density of mass
suspended
4.If the time period of one spring is T1, and that of second spring is T2, and if they are connected in series,then Tseries = T1 2 + T2 2 and if they are connected in
parallel Tparallel =T1 T2 /  [T1 2 + T2 2 ].
5.In the case of a balanced wheel or torsional pendulum,
T=2 [ I / C ]. where I = moment of inertia, C=torsional constant=restoring
torque per unit length.
6. When a ball of mass m is made to oscillate in the neck of an air chamber having volume V and neck area A, then T=2 [ mV / pA2 ].
7. If a person sitting on an oscillating swing stands up , the time period of the swing decreases.
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i joined a classroom program in bangalore for iit.
now i discontinued it and decide to study on my own.
is self study enough to clear jee????
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i joined a classroom program in bangalore for iit.
now i discontinued it and decide to study on my own.
is self study enough to clear jee????
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1st step : count the no. of valence electrons[ V ]
2nd step : now divide V by 8 ,if V >8
or
divide V by 2 ,if V <=8 -[1]
if the remainder is still not zero then
again divide it by 2, - [2]
therefore the final value = quotient in 1+ quotient in 2
as shown in the example
3rd step : compare the above obtained value with the table given below :-
sp - 2
sp2 - 3
sp3 - 4
sp3d - 5
sp3d2 - 6
sp3d3 - 7
ex:- for c2h6
step 1 - 2[4 ] + 6[1] = 4+6=10
step 2 - as 14>8
14/8, quotient=1 as remainder = 6 which is not equal to zero
therefore 6 / 2 quotient=3
therefore final value=1+3=4
comparing with the table given above
the hybridisation is sp3.
note - this is not applicable to all compounds
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i joined a institution for iitjee. now i realise that this exam is all about hardwork.
so i discontinued it . now i wanna know how to prepare a time table for my preparation. is my decision right or wrong ? and plz!!!!!!!! give some tips to achieve it.
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related to my intersets- thank you!!!!!!!
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