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$y=e^{(t+2)x}$ is a solution of equation $\large\frac{d^2y}{dx^2}-\frac{4dy}{dx}$$+4y=0$ then t equals
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q69
easy
asked
Feb 6, 2014
by
meena.p
1
answer
Name the axes are their in the ellipse
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q69
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Find solution : $\large\frac{dy}{dx} $$= 1+ \sqrt {y-x+3}$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q68
medium
asked
Feb 6, 2014
by
meena.p
1
answer
A ellipse is the locus of a point which moves in a plane such that its distance from a fixed point (i.e focus) is a constant ratio from a _____________
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q68
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Find solution : $\large\frac{dy}{dx}$$=y (x^2y^2-1)$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q67
medium
asked
Feb 6, 2014
by
meena.p
1
answer
An infinite number of charges each numerically equal to q and of the same sign are placed along the x-axis at $\;x=1 ,2 ,4 ,8----\;.$ Find elctric potential at $\;x=0$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the length of tangent,subtangent,normal and subnormal to $y^2=4ax$ at $(at^2,2at)$
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q67
difficult
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Two point charges $\;q_{1}$ and $\;q_{2}$ are placed at a certain distance d from each other . The interacting force between them is F . Now both charges kept in oil of relative permittivity 5 . What is the new value of force between them
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
At a certain distance from a point charge , the field intensity is $\;500 V/m\;$ and the potential is 1500 V . The magnitude of charge is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the solution : $ x^2y'=1-xy$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q66
easy
asked
Feb 6, 2014
by
meena.p
1
answer
What is the ratio of the Rydberg constant for helium to hydrogen atom?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
easy
q175
asked
Feb 6, 2014
by
sharmaaparna1
1
answer
Find the solution : $-x dy +(y+\sqrt {xy})dx=0$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q65
difficult
asked
Feb 6, 2014
by
meena.p
1
answer
Determine functions $y= 2e^{-x}+ 3e^{2x}$ is solution to which of following differential equation
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q64
medium
asked
Feb 6, 2014
by
meena.p
1
answer
What is energy per mol of photons of FM radiowaves with V=102.5 MHZ ?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
easy
q174
asked
Feb 6, 2014
by
sharmaaparna1
1
answer
If the normal to a parabola $y^2=4ax$ make an angle $\theta$ with the axis and $\phi$ is the angle it makes when it cut the parabola again find the relation between $\theta$ & $\phi$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q66
difficult
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Solve : $ y dx +x dy +\sin y \cos ^2 (xy) dy+e^x \cos^2 (xy) dx=0$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q63
difficult
asked
Feb 6, 2014
by
meena.p
1
answer
Find curve in $x-y$ plane which passes through$(1,1)$ . Intersects line $y=x$ at right angle at that point and satisfies $xy''+2y''=0$
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q62
medium
asked
Feb 6, 2014
by
meena.p
1
answer
The dissociation energy of $H_2$ is 430.53KJ. If $H_2$ is exposed to light energy of wavelength 253.7 nm , what $\%$ of light energy will be converted into kinetic energy?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q173
asked
Feb 6, 2014
by
sharmaaparna1
1
answer
Find the vertex,lactus rectum,axis and the directix of the parabola $(y-2)^2=4(x-1)$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q65
difficult
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Find the curve $y= f(x) $ through the origin for which $y''=y'$ and tangent at origin is $y=x$
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q61
difficult
asked
Feb 6, 2014
by
meena.p
1
answer
Find all curves in x-y plane such that tangent at each point (x,y) of curves intersects the x-axis at $(x-1,0)$
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q60
easy
asked
Feb 6, 2014
by
meena.p
1
answer
Find all curves in x-y plane such that tangent at each point (x,y) of curves intersects the x-axis at $(x-1,0)$
jeemain
math
class12
unit10
differential-equations
q60
easy
asked
Feb 6, 2014
by
meena.p
0
answers
An electrical charge $\;4\times10^{-8} C\;$ is placed at the point $\;(2 ,3 ,5)\;.$ At the point $\;(5 , 3, 1) m \;$ electric field vector will be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the area of triangle inscribed in the parabola $y^2=4ax$ with vertices $(x_1,y_1),(x_2,y_2)$ & $(x_3,y_3)$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q64
difficult
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Calculate the maximum wavelength in $A^{\large\circ}$ a photon that can initiate the reaction. $Cl_2(g)\rightarrow 2cl(g), \bigtriangleup H = 247$ KJ/mol
sat
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q172
asked
Feb 6, 2014
by
sharmaaparna1
1
answer
Find the centroid of the triangle formed by the feet of the three normal lies on the axis of parabola?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q63
difficult
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Sodium atom emits light with a wavelength of 330nm when an electron moves from a 4p orbital to a 3s orbital. what is the energy difference between the orbitals in KJ/mol?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q171
asked
Feb 6, 2014
by
sharmaaparna1
1
answer
Find the equation of tangent to the parabola $(y-6)^2=4a(x-p)$ at $(at^2,2at)$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q62
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
If the potential at the centre of a uniformly charged hollow sphere of radius R is V then electric field at a distance r from the centre of sphere will be $\;(r > R)$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
An argon laser emits blue light with a wavelength of 488.0nm. How many photon are emitted by this laser in 2.00 sec,operating a power of 515 milliwatts?(one watt = 1J$S^{-1}$)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q170
asked
Feb 6, 2014
by
sharmaaparna1
1
answer
Find the locus of the points of intersection of the mutually perpendicular tangents to a parabola?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q61
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Find the magnitude of net electric field at the centre of square having charges arranged as shown in figure
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the equation of parabola whose vertex is (4,2) and focus is (6,2)?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q60
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
The initial value problem governing the current i following in an RL circuit when a step voltage of magnitude $\in$ is applied to circuit at $t=0$ is given by (R, L, t are constants ) $iR= \large\frac{Ldi}{dt} $$=\in, t > 0, i(0)=0$ Determine limiting value of i as $t \to \infty$
jeemain
math
class12
ch9
differential-equations
solving-using-separation-of-variables
q59
medium
asked
Feb 6, 2014
by
meena.p
1
answer
The potential at a point x due to some charges situated on the x- axis is given by $\;V (x) = \large\frac{20}{(x^2-4)} volt\;$. The electric field at x = 4m is given by
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the length of lactus Rectum for the parabola $y^2=4ax$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q59
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
A ratio active substance dis integrals at a rate proportional to amount of substance present. $50 \%$ of amount disintegrates in $1000$ years. Approximately what $\%$ of substance will disintegrate in $50$ years ?
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q58
medium
asked
Feb 6, 2014
by
meena.p
1
answer
A charge particle 'q' is shot towards another charged particle 'Q' which is fixed , with a speed 'v'.It approaches 'Q' upto a closest distance r and then returns . If q were given a speed of '2v' the closest distance of approach would be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the area of triangle by tangents at the point $P(at_1^2,2at_1)$ & $Q(at_2^2,2at_2)$ for the parabola $y^2=4ax$ .
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q58
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Charge Q is given a displacement $\;\overrightarrow{r}=a \hat{i} + b \hat{j}\;$ in an electric field $\;\overrightarrow{E}=E_{1} \hat{i} + E_{2} \hat{j}\;.$ The work done is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the point of intersection of tangents at any two points on the parabola $y^2=4ax$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q57
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
A drop of liquid evaporates at a rate proportional to its area of surface. If the radius initially is $4\;mm$ and $5$ minutes later, the radius is reduced to $2\; mm$, find radius of drop as a function of time ?
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q57
medium
asked
Feb 6, 2014
by
meena.p
1
answer
Two thin wire rings each having radius R are placed at a distance d apart with their axes coinciding . The charges on the two rings are +Q and -Q .The potential difference between the centres of the two rings is
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the point of intersection of normals at any two points on the parabola $y^2=4ax$
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q56
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
There is an electric field E in x - direction . If the work done on moving a charge of 0.2C through a distance of 2m along a line making an angle $\;60_{0}\;$ with x - axis is 4J . What is value of E
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the relation between $'t_1'$ meets the parabola again at $'t_2'$ for the parabola $y^2=4ax$?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q55
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
A charged particle of mass 100g and charge $\;10^{-3} C\;$ is suspended through a thread . A horizontal electric field $\; E=\sqrt{3}\times10^{3} NC^{-1}\;$ exists in region . Find the angle made by thread with verticle .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Show that normal to the parabola $y^2=4x$ at the point (1,2) meet it again at some point of parabola, find the point?
jeemain
math
class11
coordinate-geometry-conic -sections
parabola
ch11
q54
medium
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Observation show that rate of change of atmosphere pressure P with attitude h is proportional to pressure. Assume that pressure at 6000 meter is half of its value $P_0$ at sea level, find formula for pressure at any height.
jeemain
math
class12
ch9
differential-equations
solving-using-separation-of-variables
q56
easy
asked
Feb 6, 2014
by
meena.p
1
answer
The growth rates of a bacteria population is proportional to its size. Initially the population is $10,000$ while after 10 days its size is $25,000$ . What will be population after 20 days?
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q55
easy
asked
Feb 6, 2014
by
meena.p
1
answer
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