Maths-

General

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### Question

#### If the locus of the mid points of the chords of the ellipse , drawn parallel to is then

#### The correct answer is:

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### Related Questions to study

Maths-

#### If ^{n}C_{r} denotes the number of combinations of n things taken r at a time, then the expression ^{n}C_{r+1} + ^{n}C_{r –1} + 2 × ^{n}C_{r} equals-

#### If ^{n}C_{r} denotes the number of combinations of n things taken r at a time, then the expression ^{n}C_{r+1} + ^{n}C_{r –1} + 2 × ^{n}C_{r} equals-

Maths-General

maths-

#### The number of ways is which an examiner can assign 30 marks to 8 questions, giving not less than 2 marks to any question is -

#### The number of ways is which an examiner can assign 30 marks to 8 questions, giving not less than 2 marks to any question is -

maths-General

physics-

#### An intense stream of water of cross-sectional area strikes a wall at an angle with the normal to the wall and returns back elastically. If the density of water is and its velocity is ,then the force exerted in the wall will be

Linear momentum of water striking per second to the wall , similarly linear momentum of reflected water per second

Now making components of momentum along - axes and -axes. Change in momentum of water per second

By definition of force, force exerted on the Wall

Now making components of momentum along - axes and -axes. Change in momentum of water per second

By definition of force, force exerted on the Wall

#### An intense stream of water of cross-sectional area strikes a wall at an angle with the normal to the wall and returns back elastically. If the density of water is and its velocity is ,then the force exerted in the wall will be

physics-General

Linear momentum of water striking per second to the wall , similarly linear momentum of reflected water per second

Now making components of momentum along - axes and -axes. Change in momentum of water per second

By definition of force, force exerted on the Wall

Now making components of momentum along - axes and -axes. Change in momentum of water per second

By definition of force, force exerted on the Wall

physics-

#### The force required to stretch a spring varies with the distance as shown in the figure. If the experiment is performed with above spring of half length, the line will

When the length of spring is halved, its spring constant will becomes double

Slope of force displacement graph gives the spring constant of spring

If becomes double then slope of the graph increases graph shifts towards force- axis

Slope of force displacement graph gives the spring constant of spring

If becomes double then slope of the graph increases graph shifts towards force- axis

#### The force required to stretch a spring varies with the distance as shown in the figure. If the experiment is performed with above spring of half length, the line will

physics-General

When the length of spring is halved, its spring constant will becomes double

Slope of force displacement graph gives the spring constant of spring

If becomes double then slope of the graph increases graph shifts towards force- axis

Slope of force displacement graph gives the spring constant of spring

If becomes double then slope of the graph increases graph shifts towards force- axis

physics-

#### Two small particles of equal masses start moving in opposite directions from a point in a horizontal circular orbit. Their tangential velocities are and , respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at , these two particles will again reach the point

Let initially particle is moving in anticlockwise direction and in clockwise direction

As the ratio of velocities of and particles are , therefore ratio of their distance covered will be in the ratio of . It means they collide at point B

After first collision at B, velocities of particles get interchanged, ., will move with and particle with

Second collision will take place at point C. Again at this point velocities get interchanged and third collision take place at point A

So, after two collision these two particles will again reach the point A

As the ratio of velocities of and particles are , therefore ratio of their distance covered will be in the ratio of . It means they collide at point B

After first collision at B, velocities of particles get interchanged, ., will move with and particle with

Second collision will take place at point C. Again at this point velocities get interchanged and third collision take place at point A

So, after two collision these two particles will again reach the point A

#### Two small particles of equal masses start moving in opposite directions from a point in a horizontal circular orbit. Their tangential velocities are and , respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at , these two particles will again reach the point

physics-General

Let initially particle is moving in anticlockwise direction and in clockwise direction

As the ratio of velocities of and particles are , therefore ratio of their distance covered will be in the ratio of . It means they collide at point B

After first collision at B, velocities of particles get interchanged, ., will move with and particle with

Second collision will take place at point C. Again at this point velocities get interchanged and third collision take place at point A

So, after two collision these two particles will again reach the point A

As the ratio of velocities of and particles are , therefore ratio of their distance covered will be in the ratio of . It means they collide at point B

After first collision at B, velocities of particles get interchanged, ., will move with and particle with

Second collision will take place at point C. Again at this point velocities get interchanged and third collision take place at point A

So, after two collision these two particles will again reach the point A

maths-

#### In a model, it is shown that an arch of abridge is semi-elliptical with major axis horizontal. If the length of the base is 9 m and the highest part of the bridge is 3 m from the horizontal, the best approximation of the height of the arch, 2 m from the centre of the base is

#### In a model, it is shown that an arch of abridge is semi-elliptical with major axis horizontal. If the length of the base is 9 m and the highest part of the bridge is 3 m from the horizontal, the best approximation of the height of the arch, 2 m from the centre of the base is

maths-General

maths-

#### The number of non-negative integral solutions of x + y + z n, where n N is -

#### The number of non-negative integral solutions of x + y + z n, where n N is -

maths-General

maths-

#### Between two junction stations A and B there are 12 intermediate stations. The number of ways in which a train can be made to stop at 4 of these stations so that no two of these halting stations are consecutive is -

#### Between two junction stations A and B there are 12 intermediate stations. The number of ways in which a train can be made to stop at 4 of these stations so that no two of these halting stations are consecutive is -

maths-General

maths-

#### If n objects are arranged in a row, then the number of ways of selecting three of these objects so that no two of them are next to each other is -

#### If n objects are arranged in a row, then the number of ways of selecting three of these objects so that no two of them are next to each other is -

maths-General

maths-

#### The number of numbers between 1 and 10^{10} which contain the digit 1 is -

#### The number of numbers between 1 and 10^{10} which contain the digit 1 is -

maths-General

maths-

#### The number of rectangles in the adjoining figure is –

#### The number of rectangles in the adjoining figure is –

maths-General

chemistry-

#### Assertion :this equilibrium favours backward direction.

Reason :is stronger base than

#### Assertion :this equilibrium favours backward direction.

Reason :is stronger base than

chemistry-General

physics-

#### Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit. Their tangential velocities are respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at ,these two particles will again reach The point

A s first collision one particle having speed 2v will rotate

while other particle having speed will rotate

At first collision they will exchange their velocities. Now as shown in figure, after two collisions they will again reach at point A.

while other particle having speed will rotate

At first collision they will exchange their velocities. Now as shown in figure, after two collisions they will again reach at point A.

#### Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit. Their tangential velocities are respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at ,these two particles will again reach The point

physics-General

A s first collision one particle having speed 2v will rotate

while other particle having speed will rotate

At first collision they will exchange their velocities. Now as shown in figure, after two collisions they will again reach at point A.

while other particle having speed will rotate

At first collision they will exchange their velocities. Now as shown in figure, after two collisions they will again reach at point A.

physics-

#### The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position are The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are

#### The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position are The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are

physics-General

physics-

#### The potential energy of a particle varies with distance as shown in the graph.

The force acting on the particle is zero at

it is clear that slope of curve is zero at point and

for point and

for point and

#### The potential energy of a particle varies with distance as shown in the graph.

The force acting on the particle is zero at

physics-General

it is clear that slope of curve is zero at point and

for point and

for point and