Home
Class 12
PHYSICS
A dancer is standing on a stool rotating...

A dancer is standing on a stool rotating about the vertical axis passing through its centre. She pulls her arms towards the body reducing her moment of inertia by a factor of n. The new angular speed of turn table is proportional to

A

`n^(0)`

B

`n^(1)`

C

`n^(-1)`

D

`n^(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER 2019

    TARGET PUBLICATION|Exercise MCQ|45 Videos
  • SEMICONDUCTORS

    TARGET PUBLICATION|Exercise Evaluation Test|17 Videos

Similar Questions

Explore conceptually related problems

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

What is the moment of inertia of a hollow sphere about an axis passing through its centre ?

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

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 sphere of radius R about an axis passing through its centre is proportional to-

TARGET PUBLICATION-ROTATIONAL MOTION -MCQ
  1. A swimmer while jumping into water from a height easily forms a loop i...

    Text Solution

    |

  2. Kinetic energy of rotation E and angular momentum L are related as

    Text Solution

    |

  3. A dancer is standing on a stool rotating about the vertical axis passi...

    Text Solution

    |

  4. A flywheel rotating about a fixed axis has a kinetic energy of 225 J w...

    Text Solution

    |

  5. The value of angular momentum of the earth rotating about its own axis...

    Text Solution

    |

  6. A uniform horizontal circular platform of mass 200 kg is rotating at ...

    Text Solution

    |

  7. If the earth were to suddenly contract to 1//n^(th) of its present rad...

    Text Solution

    |

  8. A stone of mass 1 kg is rotated in a horizontal circle of radius 0.5 m...

    Text Solution

    |

  9. A uniform disc of radius 'a' and mass 'm' is rotating freely with angu...

    Text Solution

    |

  10. If the angular momentum of a body increases by 50%, its kinetic energy...

    Text Solution

    |

  11. A rigid and a disc of different masses are rotating with the same kine...

    Text Solution

    |

  12. A mass is whirled in a circular path with a constant angular velocity ...

    Text Solution

    |

  13. A ball of radius 10 cm and mass 8 kg rolls down a ramp of length 3.5 m...

    Text Solution

    |

  14. A disc rotates horizontal at the rate of 100 rpm and M.I. of the disc ...

    Text Solution

    |

  15. A disc of uniform thickness and radius 50 cm is made of two zones. The...

    Text Solution

    |

  16. A wheel is rotating freely at an angular speed of 800 rev/min on a sha...

    Text Solution

    |

  17. wheel rotates with angular velocity 500 r.p.m. on a shaft. Second iden...

    Text Solution

    |

  18. If the radius of the earth contracts to half of its present value with...

    Text Solution

    |

  19. Two discs of moments of inertia I1 and I2 about their respective axes,...

    Text Solution

    |

  20. A pot-maker rotates pot-making wheel of radius 3 m by applying a force...

    Text Solution

    |