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 Chirag...I rock.. ..'s messages in the community 1 2 3 ... 24 25 26 GO Go to Page...
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 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
In a cyclic process,

dU=0
therefore,
dQ=dW
nCpdT=nCvdT
therefore,
Cp=Cv?????

Can anyone please explain me the reason for the result????

Thanks....

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
therefore,
dW=dU
nRdT=-nCvdT
therefore,
R=-Cv
Cv=-R
Can anyone explain me why Cv turns out to be negative....

Thanks.....
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
Let n be a positive integer. Then the gratest positive integer k such that nk+1 divides 1+n+n2+.....+n511 is.......

Points to be remembered.:-
1) Answer with full and clear solution.

Awards.:- A definite 5 nickel salute

For any doubts and confusion, please post it in the forum....

Thank you...

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
When n is even, the sum of the first n terms of 12+2*22+32+2*42+.....is n(n+1)2/2.. then the sum to n terms when n is odd is.......

Awards.:- A 5 nickel salute

For any doubts and confusion please post in the respective forum....

Thank you...
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
shru_itz2005,

It's not necessary that you must be answered by a expert, because there are many members in GOIIT, that can solve the problem without the help of a expert......

I think you are new to GO IIT. This site is a place to discuss and not just to compel....

By the way, welcome to GO IIT.. Just rate me for my warm welcome...........

Thank you.........

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
Q.:-
A clock with a mettalic pendulum is 5 seconds fast each day at a temp. of T1=15oC and 10 seconds slow at a temperature of T1=30oC. the coeffcient of the pendulum   of thermal expansion of the pendulum metal is...

(A)2.3*10-3/oC
(B)2.3*10-4/oC
(C)2.3*10-5/oC
(D)2.3*10-6/oC

Awards:- A 5 nickel salute.

Thank you......

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
Anjishnu,
mix=(1n1 + 2n2)/(n1+n2), this formula is absolutely wrong.....
correct formula is ,
mix=Cpn1+Cp'n2/Cvn1+Cv'n2

Joyfrancis, initially, I had made a mistake by not considering Cv in the denominator....
Sorry, it' was my mistake, but i have posted the corrected soln already.....

Magiclko,regarding the proof can you please refer H. C. Verma part II page 75 Solved example 10...
I will not be able to write the whole proof due to typing constraints....Please co-operate... If still you are unable to get , I will help you.....

Thanks.....

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

Since density*Volume=Mass

Therefore when volume is tending to zero, mass will also tend to zero..........

 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]
Joyfrancis you are absolutely wrong, Cp or Cv cannot be equal to 1.66, since it is in terms of R...

Neelshv's formula is also wrong....

I have corrected my answer, now it is absolutely correct... Initially I had made a mistake by not considering Cv in the denominator... My formula is absolutely correct.. Hope you check it in H. C. Verma....

Ans.:-n1/n2=1/2

Soln.:-

mix=Cpn1+Cp'n2/Cvn1+Cv'n2

For monoatomic gas, Cp=2.5R, Cv=1.5R
For Diatomic gas, Cp'=3.5R, Cv'=2.5R

1.5=2.5R*n1+3.5Rn2/1.5Rn1+2.5R' 2

4.5n1+7.5n2=5*n1+7n2

therefore,

0.5n1=0.5n2

therefore,

n1/n2=1/1........

Thanx....
 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]
We know that,
sin-1a+sin-1b=sin-1{asqrt(1-b2)+bsqrt(1-a2)}

You may use the same for 3x/5 and 4x/5,
where you can take
a=3x/5 and b=4x/5

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
Deepak, it is not necessary ot convert into tan inverse........ It will be OK if you use directly sum of sin inverse..........
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
When you solve the equation you get,
x=1 or x=-1
But, you also get another root as '0' when you solve the eqn....
therefore,
x=-1,0,1
A,B,C.

If you want the soln please post the query...

thanx

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
is there any friction between hori. surface and atrip since with friction, strip will not move further l dist.

 Discussion Forums -> This Post 2 points    (0    in 1 votes )   [?]
Force equation is a foolproof method....

But, by conservation of energy, you shld get your answer correctly... b'coz energy and force equation can be related to each by IInd or IIIrd kinematic eqn, where we can convert velocity in accln, vice-versa....

So,it doesn't matter, if you use either of them.....
But, for special cases, it may differ....

If you are convinced, please don't forget to rate me.....

Thanx

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
U=av^1/3

ncvT=av^1/3.......

TV^-1/3=constant

PV^-2/3=constant

therefore n'=-2/3(Polytrophic Index)

therfore

c=R/n'-1-R/gamma-1....This is a formula to calculate molar heat capacity....

c=9R/2.......

Hope I have got it right......

Thanxs
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
neeleshv, your formula is absolutely incorrect...

Hope you correct it, I have written it down....

But, btw atleast you gave it a try......

Hope you rate me........
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

Ans.:-n1/n2=3/5

Soln.:-

=Cpn1+Cp'n2/n1+n2

1.5=1.66*n1+1.4n2/n1+n2

1.5n1+1.5n2=1.66*n1+1.4n2

therefore,

1/6n1=1/10n2

therefore,

n1/n2=3/5...

Hope it is correct.......

Thanx....

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
Work done=Area under P-V curve

=.5*150*10^-3*40*10^3
=3000J

Now,
W=-U

Therefore, the change in Internal energy is -3000J

Hope my soln is correct...

Thanx..
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
The sign is important..
If the magnitudes are only added, then you will get a wrong picture of the focal length.

You must have realised it in a concave or convex lens experiment....

For micrometer screw gauge:-
1)L.C.= Smallest division on main scale/No. of division on main scale.=0.001cm
2)It consists of M.S.R. and C.S.R.
3) M.S.R is of 0.01 cm and C.S.R. is 0.001 cm.

For Vernier Calliper:-
1)L.C.= Smallest division on main scale/No. of division on main scale.=0.01cm
2)It consists of M.S.R. and Vernier scale reading(V.S.R.)
3) M.S.R is of 0.1 cm and C.S.R. is 0.01 cm.

Hope this solves your problem and if you have any further doubts, please post it....

Rajat,Best of Luck for IITJEE..

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