Physics-

#### A binary star consists of two stars (mass 2.2 ) and B (mass 11 ), where is the mass of the sun. They are separated by distance and are rotating about their centre of mass, which is stationary. The ratio of the total angular momentum of the binary star to the angular momentum of star about the centre of mass is

Physics-General

- 7
- 6
- 10
- 9

#### Answer:The correct answer is: 6 (as will be same in both cases)

(as

The correct answer is 6.

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### Related Questions to study

physics-

#### Consider a body, shown in figure, consisting of two identical balls, each of mass connected by a light rigid rod. If an impulse is impared to the body at one of its ends, what would be its angular velocity?

Let be the angular velocity of the rod. Applying ,

Angular impulse = change in angular momentum about centre of mass of the system

Angular impulse = change in angular momentum about centre of mass of the system

#### Consider a body, shown in figure, consisting of two identical balls, each of mass connected by a light rigid rod. If an impulse is impared to the body at one of its ends, what would be its angular velocity?

physics-General

Let be the angular velocity of the rod. Applying ,

Angular impulse = change in angular momentum about centre of mass of the system

Angular impulse = change in angular momentum about centre of mass of the system

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#### A force of- F acts on , the origin of the coordinate system. The torque about the point 1, -(a) is

#### A force of- F acts on , the origin of the coordinate system. The torque about the point 1, -(a) is

physics-General

maths-

#### Assertion (A): If the system of equations have non zero solution then

Reason (R): If the system of equations has a non zero solution then is singular

#### Assertion (A): If the system of equations have non zero solution then

Reason (R): If the system of equations has a non zero solution then is singular

maths-General

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#### The area of the region bounded by y=|x-1| and y=1 in sq. units is

#### The area of the region bounded by y=|x-1| and y=1 in sq. units is

maths-General

maths-

#### The area of the elliptic quadratic with the semi major axis and semi minor axis as 6 and 4 respectively

#### The area of the elliptic quadratic with the semi major axis and semi minor axis as 6 and 4 respectively

maths-General

physics-

#### A particle of mass moves in the plane with a velocity along the straight line . If the angular momentum of the particle with respect to origin is when it is at and when it is at , then

From the definition of angular momentum,

Therefore, the magnitude of is

where is the distance of closest approach of the particle to the origin. As is same for both the particles, hence .

Therefore, the magnitude of is

where is the distance of closest approach of the particle to the origin. As is same for both the particles, hence .

#### A particle of mass moves in the plane with a velocity along the straight line . If the angular momentum of the particle with respect to origin is when it is at and when it is at , then

physics-General

From the definition of angular momentum,

Therefore, the magnitude of is

where is the distance of closest approach of the particle to the origin. As is same for both the particles, hence .

Therefore, the magnitude of is

where is the distance of closest approach of the particle to the origin. As is same for both the particles, hence .

physics-

#### A solid sphere of radius has moment of inertia about its geometrical axis. If it is melted into a disc of radius and thickness . If its moment of inertia about the tangential axis (which is perpendicular to plane of the disc), is also equal to , then the value of is equal to

or

#### A solid sphere of radius has moment of inertia about its geometrical axis. If it is melted into a disc of radius and thickness . If its moment of inertia about the tangential axis (which is perpendicular to plane of the disc), is also equal to , then the value of is equal to

physics-General

or

maths-

#### The area of the region bounded by y= and the x-axis is

#### The area of the region bounded by y= and the x-axis is

maths-General

maths-

#### Area of the region bounded by y is

#### Area of the region bounded by y is

maths-General

maths-

#### Area of the region bounded by y=and y=2 is

Area

sQ. units

sQ. units

#### Area of the region bounded by y=and y=2 is

maths-General

Area

sQ. units

sQ. units

maths-

#### The area bounded by y=cos x, y=x+1 and y=0 in the second quadrant is

#### The area bounded by y=cos x, y=x+1 and y=0 in the second quadrant is

maths-General

physics-

#### A uniform rod of length and mass is free to rotate about point . The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about is, the initial angular acceleration of the rod will be

The moment of inertia of the uniform rod about an axis through one end and perpendicular to its length is

Where is mass of rod and is length.

Torque acting on centre of gravity of rod is given by

or

or

or

Where is mass of rod and is length.

Torque acting on centre of gravity of rod is given by

or

or

or

#### A uniform rod of length and mass is free to rotate about point . The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about is, the initial angular acceleration of the rod will be

physics-General

The moment of inertia of the uniform rod about an axis through one end and perpendicular to its length is

Where is mass of rod and is length.

Torque acting on centre of gravity of rod is given by

or

or

or

Where is mass of rod and is length.

Torque acting on centre of gravity of rod is given by

or

or

or

physics-

#### A joint is formed by two identical rods and each of mass and length in the plane as shown. Its moment of inertia about axis coinciding with is

#### A joint is formed by two identical rods and each of mass and length in the plane as shown. Its moment of inertia about axis coinciding with is

physics-General

physics-

#### A small object of uniform density roll up a curved surface with an initial velocity . If reaches up to a maximum height of with respect to the initial position. The object is

Body is disc.

#### A small object of uniform density roll up a curved surface with an initial velocity . If reaches up to a maximum height of with respect to the initial position. The object is

physics-General

Body is disc.

physics-

#### Four balls each of radius 10 cm and mass 1 kg, 2kg, 3 kg and 4 kg are attached to the periphery of massless plate of radius 1 m. What is moment of inertia of the system about the centre of plate?

Moment of inertia of the system about the centre of plane is given by

#### Four balls each of radius 10 cm and mass 1 kg, 2kg, 3 kg and 4 kg are attached to the periphery of massless plate of radius 1 m. What is moment of inertia of the system about the centre of plate?

physics-General

Moment of inertia of the system about the centre of plane is given by