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Catalogs Discussion Forums -> Electricity -> Electrostat -> Go to message
This Post 20 points    (4 Olaaa!! Perrrfect answer.   in 4 votes )   [?]
9 replies   

\mbox{The 3 charges will be 3 vertices of a tetrahedron }\\ \mbox{with the fourth vertex as the point of suspension}\\<br/>\mbox{Draw the perpendicular bisector of one side}\\<br/>\mbox{ from the point of suspension}\\<br/>\frac{F_(electr.)}{F_(gravit.)}=\frac{x/2}{\sqrt{{l^2}-\frac{x^2}{4}}}\\<br/>\mbox{approximate it as}\frac{x}{2l} (x<<l)\\<br/>\frac{2q^2}{4 \pi \epsilon_0 x^2 mg}=\frac{x}{2l}\\<br/>x=q^\frac{2}{3}(\frac{l}{\pi \epsilon_0 mg})^\frac{1}{3}\\<br/>\mbox{Now for some manipulation}\\<br/>\frac{dx}{dt}=\frac{dx}{dq} \cdot \frac{dq}{dt}\\<br/>\frac{dq}{dt}=\frac{a}{\frac{dx}{dq} \cdot \sqrt{x}}\\<br/>\frac{dx}{dq}=(\frac{l}{\pi \epsilon_0 mg})^\frac{1}{3}q^\frac{1}{3}\\<br/>\sqrt{x}=(\frac{l}{\pi \epsilon_0 mg})^\frac{1}{6}q^\frac{1}{3}\\<br/>\mbox{Substitute these and ull find}\\<br/>\frac{dq}{dt}=\frac{3a}{2}\sqrt{\frac{\pi \epsilon_0 mg}{l}}\\
Catalogs Discussion Forums -> Algebra -> question -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
8 replies   

Now I think


 


In Safari, (the browser i use) mozilla n all. usin ctrl+c copies the smileys html code:w:w


 


whereas a rt clic n copy copies it as an image.:w:w


 


the former is why an auto html link is created while the latter is not useful


 


 


 


:gu:gu
Catalogs Discussion Forums -> Algebra -> question -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
8 replies   

I didnt mean to :rot:rot:rot


 


:gu:gu:gu
Catalogs Discussion Forums -> Algebra -> question -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
8 replies   


:gu:gu


Cool !!


I was talking abt the editor:rot :rot :rot


 


:d:d
Catalogs Discussion Forums -> Algebra -> any one out here do this ppl.......permutations........combinations -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
38 replies   
ans is 64 i think,
if im rt this was a qn in the contest swordfish.
Catalogs Discussion Forums -> Organic Chemistry -> REACTION MECHANISM-3 -> Go to message
This Post 5 points    (1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]
9 replies   
chilbi
u r wrong,
wat is asked here is the
D or L (not d or l - the dextro and laevo as u said)
D or L is actually cnfiguring a compd relative to glyceraldehyde
any compd that hs a config simlar to d glyceraldehyde is calld D else L
Catalogs Discussion Forums -> Electricity -> Solve... -> Go to message
This Post 5 points    (1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]
9 replies   
sorry
guess i was busy painting wen ramyani already posted
Catalogs Discussion Forums -> Electricity -> Solve... -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
9 replies   
Re:Solve...
Download the img:
Catalogs Discussion Forums -> Trignometry -> period -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
2 replies   
The function can be written as
2^|tanx|+2^|cotx|
Now
replace x by pi/2 +x
2^|-cotx|+2^|-tanx|=2^|tanx|+2^|cotx|=f(x)
u get
 f(pi/2+x)=f(x)
so the function has period pi/2
Catalogs Discussion Forums -> Electricity -> easy capacitor question -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
13 replies   
ans is 3c
as karthik said
2c and 4c are in parallel so c eff for dem is 6c
now d 2 6c s are in series,
6c*6c/12c
3c
Catalogs Discussion Forums -> Algebra -> the no. of real roots of -> Go to message
This Post 12 points    (2 Olaaa!! Perrrfect answer.   in 3 votes )   [?]
5 replies   
its of d form e^t=1-t
lhs is an increasing function
rhs is a decreasing function
clearly only one real root is possible
and thats at t=0
Catalogs Discussion Forums -> Mechanics -> Fluids -> Go to message
This Post 2 points    (0 Olaaa!! Perrrfect answer.   in 1 votes )   [?]
5 replies   
i think d ans is 5.48 m/s
obv veloc of efflux shd b >[ ] 2gh .
so this is the only poss. option??
Catalogs Discussion Forums -> Algebra -> log -> Go to message
This Post 2 points    (0 Olaaa!! Perrrfect answer.   in 1 votes )   [?]
6 replies   
@conjurer lni=ipi/2 not e/2
Catalogs Discussion Forums -> Algebra -> Summation -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
4 replies   
-1.
the summation includes  the roots of the eqn z^9=1 all but for 1 itself.
sum of roots=0
so gvn sum =-1.
Catalogs Discussion Forums -> Trignometry -> solve -> Go to message
This Post 5 points    (1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]
2 replies   
i think u meant cos-1x+cos-1y+cos-1z=3pi
simple
range of cos-1  is [0,pi]
so each x=y=z=-1
now d remaining is obv.
 
 
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