Home
Class 12
PHYSICS
A round disc of moment of inertia I2 abo...

A round disc of moment of inertia `I_2` about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia `I_1` rotating with an angular velocity `omega` about the same axis. The final angular velocity of the combination of discs is.

A

`omega`

B

`(I_1omega)/(I_1+I_2)`

C

`((I_1+I_2)omega)/I_1`

D

`(I_2omega)/(I_1+I_2)`

Text Solution

Verified by Experts

The correct Answer is:
B
form conservation of angular momentum
`I_1omega=(I_1+I_2)omega'rArr omega'=(I_1omega)/(I_1+I_2)`
Promotional Banner

Topper's Solved these Questions

  • NEET

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise PHYSICS|157 Videos

  • NEET

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise QUESTION|95 Videos

  • MOTION IN TWO AND THREE DIMENSION

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise All Questions|47 Videos

  • NEET 2020

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise All Questions|45 Videos

Similar Questions

Explore conceptually related problems

Radius of gyration of disc rotating about an axis perpendicular to its plane passing through through its centre is (If R is the radius of disc)

Find the moment of inertia of a uniform half-disc about an axis perpendicular to the plane and passing through its centre of mass. Mass of this disc is M and radius is R.

A heavy disc is rotating with uniform angular velocity omega about its own axis. A piece of wax sticks to it. The angular velocity of the disc will

The moment of inertia of a copper disc, rotating about an axis passing through its centre and perpendicular to its plane

The moment of inertia of a circular disc about an axis passing through its centre and perpendicular to the plane is 4 kg m^(2) . Its moment of inertia about the diameter is

The moment of inertia of a circular disc about an axis passing through the circumstances perpendicular to the plane of the disc is

Calculate the moment of inertia of a disc of radius R and mass M, about an axis passing through its centre and perpendicular to the plane.

The moment of inertia of a circular disc about an axis passing through its centre and normal to its plane is "50 kg - m"^(2) . Then its moment of inertia about a diameter is

A charge Q is uniformly distributed over the surface of non - conducting disc of radius R . The disc rotates about an axis perpendicular to its plane and passing through its centre with an angular to its plane and passing through its centre of the disc. If we keep both the amount of charge placed on the disc and its angular velocity to be constant and vary the radius of the disc then the variation of the magnetic induction at the centre of the disc will br represented by the figure:

State the expression for the moment of inertia of a thin uniform disc about an axis perpendicular to its plane and through its centre. Hence deduce the expression for its moment of inertia about a tangential axis perpendicular to its plane.

NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-NEET-MCQ
  1. A round disc of moment of inertia I2 about its axis perpendicular to i...

    Text Solution

    |

  2. The damping force on an oscillator is directly proportional to the vel...

    Text Solution

    |

  3. The motion of a particle along a straight line is described by equatio...

    Text Solution

    |

  4. The horizontal range and the maximum height of a projectile are equal....

    Text Solution

    |

  5. A particle has initial velocity (2 vec(i)+3 vec(j)) and acceleration (...

    Text Solution

    |

  6. A car of mass 1000kg negotiates a banked curve of radius 90m on a fict...

    Text Solution

    |

  7. A solid cylinder of mass 3 kg is rolling on a horizontal surface with ...

    Text Solution

    |

  8. The potential energy of a particle in a force field is: U = (A)/(r^(...

    Text Solution

    |

  9. Two sphere A and B of masses m(1) and m(2) respectivelly colides. A is...

    Text Solution

    |

  10. Two persons of masses 55 kg and 65 kg respectively are at the opposite...

    Text Solution

    |

  11. ABC is an equilateral triangle with O as its centre vec(F(1)),vec(F(2)...

    Text Solution

    |

  12. When a mass is rotating in a plane about a fixed point, its angular mo...

    Text Solution

    |

  13. A spherical planet far out in space has a mass M(0) and diameter D(0)....

    Text Solution

    |

  14. A geostationary satellite is orbiting the earth at a height of 5R abov...

    Text Solution

    |

  15. The height a which the weight of a body becomes 1//16th its weight on ...

    Text Solution

    |

  16. Two sources of sound placed close to each other are wmitting progressi...

    Text Solution

    |

  17. When a string is divided into three segments of length l1,l2 and l3 th...

    Text Solution

    |

  18. One mole of an ideal gas goes from an initial state A to final state B...

    Text Solution

    |

  19. A thermodynamics system is taken trough the cycle ABCD as shown in fig...

    Text Solution

    |

  20. Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm...

    Text Solution

    |

  21. If the radius of a star is R and it acts as a black body, what would b...

    Text Solution

    |