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Catalogs Discussion Forums -> Thermal Physics -> thermo -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
5 replies   
adiabatic expansion .
 
apply p^( gamma - 1 ) / T ^ ( gamma )  = const
Catalogs Discussion Forums -> Thermal Physics -> heat transfer -> Go to message
This Post 2 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
1 replies   
See that it is an isobaric expansion .
 
so ,  dQ =  nCp dT
             
again dQ/dt  =  KA ( Ts - T ) /X ;
combining these two eqns , we get
 
      dT/ ( Ts - T )  ={  KA/( n Cp X ) } dt
integrating  ( taking final temp as Tf )
 
Ts  -  Tf / ( Ts  -  T ) = exp ( KA t / X n Cp )
 
from this reln we find Tf
Then from PVf = n RTf
we find Vf
again from PV i =  n RT ( as given )
 
we find Vi
Now we find increase in volume ( Vf - Vi )
 
distance moved =  ( Vf - Vi ) / A
Catalogs Discussion Forums -> Algebra -> Quadritic Equation -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
4 replies   
assume root of the form p + sqrt ( q )
put it for x
 
Now equate the rational & irrational part .
 
Or ,
 
Show the discriminant to be a perfect square ( a, b , c are rational )
Catalogs Discussion Forums -> Mechanics -> gravitation problem.. -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
4 replies   
Oh !!!!!!!!!!!!!!!!!!!!  Extremely sorry !!!!!!!!!!!!!!!!!
 
What u have to do is to introduce corriolis force . (  = 2mv )
Then u will get the ans .
 
Centrifugal force will not do .
 
Got it ?
Catalogs Discussion Forums -> Electricity -> Capacitors -> Go to message
This Post 2 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
1 replies   
because of conservation of charge .
Catalogs Discussion Forums -> Mechanics -> gravitation problem.. -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
4 replies   
centrifugal force = m ^2 R (  R = radius at equator )
 
                        =  m v
                         
                       =  W v /g  ( since W = mg )
 
Now the centrifugal force may add to the wt of the body or may decrease it depending on the direction of velocity of the body .
 
 
So the apparent wt is  =  W (  1 + or -  v/g ) ( proved )
Catalogs Discussion Forums -> Thermal Physics -> An iit level Q. plss help!! -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
3 replies   
apply pv power gamma = const
 
so , p1 : p2 = 3^ ( gamma ) =6.26
 
                 gamma =  1.67 for monoatomic gas
 
                            
Catalogs Discussion Forums -> Mechanics -> Waves:Standing Waves..... -> Go to message
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See ,the air in the pipe is relatively confined but the air in the atmosphere is open . This feature distinguishes thetwo media . And whenever there is a distinction betwn media there is a reflection.
Catalogs Discussion Forums -> Mechanics -> Waves:Standing Waves..... -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
7 replies   
The reflection occurs at the every jn ( where there is a discontinuity in the medum) . Here u get the jn open air (atmos )  & closed air ( inside the pipe ) .
 
These two are completely different medium . Hence we get a reflected wave .
Catalogs Discussion Forums -> Mechanics -> rotation 53 -> Go to message
This Post 5 points    (Olaaa!! Perrrfect answer.   in 1 votes )   [?]
5 replies   
Oh !!!! everything is fine .
Torque applied wrt the bottom most pt =
 
T  =  ( R + r ) 2t  =  dL / dt
 
so L  = ( R + r ) t^2
 
See ,the distance betwn the bottom most point & the point of application of force is ( R + r ) . Hence the factor ( R + r ) . I think u have now got it .
Here L denote the angular momentum sought
Catalogs Discussion Forums -> Mechanics -> particles revolving...??? -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
8 replies   
Its polar eqn is r = exp ( k )
or log r = k
Catalogs Discussion Forums -> Mechanics -> rotation 53 -> Go to message
This Post 7 points    (Olaaa!! Perrrfect answer.   in 2 votes )   [?]
5 replies   
 T  = ( R + r ) 2t
= dL/ dt
 
So L = ( R+ r ) t^2
Catalogs Discussion Forums -> Differential Calculus -> solve it plzz -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
2 replies   
 Suggesting u two methods
 
1 > 
 
find dx/ dt , dy/ dt first
 
& then find dy/dx from  dy/dt / dx/ dt
 
2>
 
see we get y^2/3  +  x^2/3  =  1/ (cos 2t ) ^1/3 .............(1 )
 
and           y^2/3    - x^2/3   = ( cos 2t ) ^2/3  ...............( 2 )
 
eliminate  cos 2t from ( 1 ) & ( 2 )  to get a reln between y & x
 
Now differentiate it wrt x to get dy/dx
Catalogs Discussion Forums -> Modern Physics -> about heisenberg's uncertainty principle and its derivation -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
8 replies   
do u know what  s in the expn mean exactly ?
 
They are std deviations with probability fn mod  ^2
 
Now the RHS of the h -principle depends on how this deviation or uncertainity is defined . Diff authors have defined it differently so there is a ' uncertainity ' in the uncertainity principle .
Catalogs Discussion Forums -> Differential Calculus -> answer it plz -> Go to message
This Post 0 points    (Olaaa!! Perrrfect answer.   in 0 votes )   [?]
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the last term isa 2 arctan (x )
 
write log sin x to the base cos x as ln sin x/ ln cos x etc
 
Now differentiate as per standard rules.
 
 
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