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 Krishna Gopal Singh's messages in the community 1 2 3 ... 275 276 277 GO Go to Page...
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 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

Integral of x^n = x^(n+1)/(n+1) . If we take n = -1 this is x^0/0 which is not defined.

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
MM of methane is 16. If rate of diffusion of methane is twice that of x then MM of X is 4*16 = 64 units
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No because there will be equall expansion of glass and mercury and mercury will not rise in glass tube on heating.

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for zero tension at topmv^2/r = mg-kq^2/r^2. solve this to get v at top. V at bottom = sqrt(v^2+4*g*r)
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
If its given then you should consider it. If it is not given you can assume it to be infinite.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
mobility = velocity/electric field so its unit is (m/s)/(V/m) = m^2/(V-s)
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a metal rod A of 25 cm length expands by 0.050 cm  when its temperature is rasied from 0 deg to 100 deg. another rod B of a different metal of length 40 cm expands by 0.040 cm for the same rise in temp. A third rod C of 50 cm length is made up of pieces of rods A and B placed end to end expands by 0.03 cm on heating from 0 deg to 50 deg. Find the lengths of each portion of the composite rod.

For rod A alpha_A = .05/25/100 = 2e-5
For rod B alpha_B = .04/40/100 = 1e-5
If composite rod is x cm A and 50-x cm B then
x*50*2e-5 + (50-x)*50*1e-5 = 0.03
x+50 = 60
x = 10
so composite rod is 10 cm A and 40 cm B
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

dU =Q-W = Q/2

so Q =2*dU = 28nCv*dT

hence specific heat = 2Cv

 Discussion Forums -> This Post 5 points    (1    in 1 votes )   [?]
a679b is divisible by 8, so 79b is devisble by 8. so b is 2. It is divisible by 9 so sum is divisible by 9 so a is 3.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
I am taking f(x) = (x/x)-(1/x)-1 = -1/x which has a range of R-{0}
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If we have a vector V. Then unit vector parallel to V is given by V/mod(V)
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Fe in + 1 oxidation state has 3 unpaired electrons hence it has a magnetic moment of sqrt(15) BM and sp3d2 hybridisation.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
4. Two through two hydrogen atoms and two through 2 lone pairs of oxygen.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
(c) is the right answer. In this case Fe exist as Fe+1 with d7 electrons and NO+ is diamagnetic. 3 unpaired electrons of Fe give it magnetic moment of sqrt(15) BM
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]

If we use concave spherical mirror and put light source at focus then reflected light will be parallel only for paraxial rays. the rays away from axis will not be parallel. In parabolic reflector the reflected rays are parallel for all cases. that is why parabolic reflectors are used in search lights.

 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
(c) is the right answer. Diastereomers may or may not be optically active.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
i) Weight of water picked from first bulb is proportional to P.ii) Weight of water picked from second bulb is proportional to Po-Piii) Weight of water absorbed by CaCl2 is proportional to Po. From this data mole fraction of organic compound = 0.087/2.036 = (26.66/M)/((26.66/M)+200). Solve this equation to get M.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
Vector AB = 6i + 6j - 6kVector AC = -5i -5j + 5kAs AC = (-5/6)AB we can say that ABC are colinear.
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
As both B and C will move for same time interval, ratio of distance will be equal to ratio of speed = 5/4
 Discussion Forums -> This Post 0 points    (0    in 0 votes )   [?]
a and c cannot remain constant as they are vectors and their direction will change in circular motion. But b and d can remain constant as they are scalar.
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