Home
Class 11
PHYSICS
A horizontal platform is rotating with u...

A horizontal platform is rotating with uniform angular velcity around the vertical axis passing through its centre. At some instant of time a viscous fluid of mass `m` is dropped at the centre and is allowed to spread out and finally fall. The angular velocity during this period :

A

Decreases continuously

B

Decreases initially and increases again

C

Remains unaltered

D

Increases continuously

Text Solution

Verified by Experts

The correct Answer is:
B

`I omega`= constant
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

    ERRORLESS|Exercise ASSERTION AND REASON|25 Videos
  • ROTATIONAL MOTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Torque and Couple)|27 Videos
  • ROTATIONAL MOTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Rolling on Inclined Plane)|54 Videos
  • NEWTON'S LAWS OF MOTION

    ERRORLESS|Exercise ASSERTION & REASON |18 Videos
  • SIMPLE HARMONIC MOTION

    ERRORLESS|Exercise Assertion & Reason|15 Videos

Similar Questions

Explore conceptually related problems

A horizontal disk is rotating with angular velocity omega about a vertical axis passing through its centre. A ball is placed at the centre of groove and pushed slightly. The velocity of the ball when it comes out of the groove -

A horizontal disc is rotating about a vertical axis passing through its centre. If an insect moves from centre to rim then the angular momentum of the system

A horizontal disc is rotating about a vertical axis passing through its centre. If an insect moves from centre to rim then the angular momentum of the system

A uniform disk of mass 300kg is rotating freely about a vertical axis through its centre with constant angular velocity omega . A boy of mass 30kg starts from the centre and moves along a radius to the edge of the disk. The angular velocity of the disk now is

A uniform horizontal circular platform of mass 200kg is rotating at 5 rpm about vertical axis passing through its centre. A boy of mass 80kg is standing at its edge. if boy moves to centre of platform, find out final angular speed

A smoothh disc is rotating with uniform angular speed omega about a fixed vertical axis passing through its centre and normal to its plane as shown. A small block of mass m is gently placed at the periphery of the disc. Then (pickup the correct alternative or alternatives)

An ice block is in a trough which is rotating about vertical axis passing through its centre. When ice melts completely, the angular velocity of the system

A horizontal disc rotates freely with angular velocity omega about a vertical axes through its centre. A rig having the same mass and radius as the disc, is now gently placed coaxially on the disc. After some time, the two rotate with a common angular velocity. then.

A particle of mass m is placed over a horizontal circular table rotating with an angular velocity omega about a vertical axis passing through its centre. The distance of the object from the axis is r . Find the force of friction f between the particle and the table.

A circular disc is rotating in horizontal plane about vertical axis passing through its centre without friction with a person standing on the disc at its edge. If the person gently walks to centre of disc then its angular velocity

ERRORLESS-ROTATIONAL MOTION-PAST YEARS QUESTIONS
  1. Which of following statements are correct ? ltbgt (a) Centre of mass ...

    Text Solution

    |

  2. A solid cylinder of mass 2 kg and radius 4 cm rotating about its axis ...

    Text Solution

    |

  3. A horizontal platform is rotating with uniform angular velcity around ...

    Text Solution

    |

  4. In an orbital motion, the angular momentum vector is :

    Text Solution

    |

  5. A constant torque acting on a uniform circular wheel changes its angul...

    Text Solution

    |

  6. A thin circular ring of mass m and radius R is rotating about its axis...

    Text Solution

    |

  7. A particle of mass m moves in the XY plane with a velocity v along the...

    Text Solution

    |

  8. Two discs are rotating about their axes, normal to the discs and passi...

    Text Solution

    |

  9. The motion of planets in the solar system is an exmaple of the conserv...

    Text Solution

    |

  10. The curve between log(e) L and log(e) P is (L is the angular momentum ...

    Text Solution

    |

  11. Two rotating bodies A and B of masses m and 2m with moments of inertia...

    Text Solution

    |

  12. Two rigid bodies A and B rotate with rotational kinetic energies E(A) ...

    Text Solution

    |

  13. There object, A : (a solid sphere), B : (a thin circular disk) and C :...

    Text Solution

    |

  14. A solid sphere is in rolling motion. In rolling motion a body prossese...

    Text Solution

    |

  15. A disc of radius 2 m and mass 100kg rolls on a horizontal floor, its c...

    Text Solution

    |

  16. A body of mass m slides down an incline and reaches the bottom with a ...

    Text Solution

    |

  17. A disc and a solid sphere of same radius but different masses roll off...

    Text Solution

    |

  18. Two particles of mass 5 kg and 10 kg respectively are attached to the ...

    Text Solution

    |

  19. A uniform rod of length 200cm and mass 500g is balanced on a wedge pla...

    Text Solution

    |

  20. From a circular ring of mass M and radius R, an arc corresponding to a...

    Text Solution

    |