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Q ow many resonance structure does tropylium ion have? ...
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Find the numbers of 4x4 array whose entries are from the set {0,1,2,3} and which are such that the sum of the numbers in each of the four rows and four columns is divisible by 4. ...
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f(x) = sinx -x find area bounded by y=f-1(x) ,tangent and normal drawn to it at the points with abscissae π and 2π . ...
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it was found the the winding radius of a tape on a cassette was reduced by half in time t1 = 20. in what time will the winding radius will be reduced by half again? ...
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when equimolar quantities of acetic acid and ethanol are at 25 C, 1/3 of acetic acid remains unreacted as shown by titration with standard alkali.Calculate concentration equilibrium constant. ...
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*Image* this came in nsep 2007 . ...
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*Image* please solve above two questions. ...
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*Image* please solve only the angular acceleration bit! ...
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prove: \frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{n} is not an integer for any value of n. ...
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a_{1}^{2}+ a_{2}^{2}+a_{3}^{2}= 25 b_{1}^{2}+b_{2}^{2}+b_{3}^{2}=100 b_{1}a_{1}+b_{2}a_{2}+b_{3}a_{3}= 50 Find \; \; \frac{a_{1}^{n}+a_{2}^{n}+a_{3}^{n}}{b_{1}^{n}+ b_{2}^{n}+b_{3}^{n}} ...
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Two circles of unit radius have their center at (0,2) and (1,0) find the equation of their parallel common tangents. ...
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A drop of mass m and density Ï is put between two glass plates at a separation 'd'.What is the force of attraction between the plates (T=surface tension) ...
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Pb(IO3)2 a sparingly soluble salt in water has a Ksp= 2.6*10-13 . To 35 mL of a 0.15 M Pb(NO3)2 solution, 15 mL of a 0.8 M KIO3 is added and a ppt. is obtained. Find the concentrations of Pb2+ and IO32- left in the solution. ...
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KVPY interview is going to be held in January . please give some tips on to go about it ! Advice needed . ...
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find the sum (nC1)2 + 2(nC2)2 + ...+ n(nCn)2 ...
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Two similar balls are connected by a string of length 2l and are placed at a separation l on smooth horizontal table. one of the balls is given a velocity v0 shown in the figure . What are velocities of the balls when the str ...
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Find the total number of three number A.P's in sequence 1,2,3,4...n? ...
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if p and q be the perpendiculars from the angular points A and B on any line passing through the vertex C of the triangle ABC, then prove that a2p2+ b2q2 - 2abpq cos C = a2b2 Sin2 C ...
