Home
Class 11
PHYSICS
A ballet dancer is rotating about his ow...

A ballet dancer is rotating about his own vertical axis. Without external torque if his angular velocity is doubled then his rotational kinetic energy is

A

halved

B

doubled

C

quadrupled

D

unchanged

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-1(C.W.)|64 Videos

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-II(C.W.)|64 Videos

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-VI|78 Videos

  • PHYSICAL WORLD

    NARAYNA|Exercise C.U.Q|10 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    NARAYNA|Exercise EXERCISE - IV|39 Videos

Similar Questions

Explore conceptually related problems

A hollow sphere partly filled with water has moment of inertia I when it is rotating about its own axis at an angular velocity omega . If its angular velocity is doubled then its moment of inertia becomes

A ballet dancer is rotating about his own vertical axis at an angular velocity 100 rpm on smooth horizontal floor. The ballet dancer folds himself close to his axis of rotation by which is moment of inertia decreases to half of initial moment of inertia then his final angular velocity is

A ballet dancer is rotating about his own vertical axis on smooth horizontal floor. I, omega, L, E are moment of inertia, angular velocity, angular momentum, rotational kinetic energy of ballet dancer respectively. If ballet dancer stretches himself away from his axis of rotation, then

A ballot dancer is rotating about hyis own vertical axis on smooth horizontal floor with a time period 0.5 sec . The dancer flods himself close to his axis of rotation due to which his radius of gyration decreases by 20% , then his new time period is

The rotational kinetic energy of a body is E. In the absence of external torque, the mass of the body is halved and its radius of gyration is doubled. Its rotational kinetic energy is

Two identical discs are positioned on a vertical axis as shown in the figure. The bottom disc is rotating at angular velocity omega_(0) and has rotational kinetic energy K_(0) . Change in the rotational kinetic energy of the system is

A horizonral circular plate is rotating about a vertical axis passing through its centre with an angular velocity omega_(0) . A man sitting at the centre having two blocks in his hands stretches out his hands so that the moment of inertia of the system doubles. If the kinetic energy of the system is K intially, its final kinetic energy will be

A horizontal circular plate is rotating about a vertical exis passing through its centre with an angular velocity omega_0 . A man sitting at the centre having two blocks in his hands stretches out his hands so that the moment of inertia of the system doubles. if the kinetic energy oif the system is K initially, its final kinetic energy will be

A fly wheel is rotating about its own axis at an angular velocity 11 rad s^(-1) , its angular velocity in revolation per minute is

NARAYNA-SYSTEM OF PARTICLES-C.U.Q.
  1. If earth shrinks then the duration of day

    Text Solution

    |

  2. A circular disc is rotating in horizontal plane about vertical axis pa...

    Text Solution

    |

  3. A ballet dancer is rotating about his own vertical axis. Without exter...

    Text Solution

    |

  4. The following motion is based on the law of conservation of angular mo...

    Text Solution

    |

  5. Two bodies with moment of inertia I1 and I2 (I2 gt I1) are rotating wi...

    Text Solution

    |

  6. A solid sphere is rotating in free space. If the radius of the sphere ...

    Text Solution

    |

  7. A circular wheel is rotating in horizontal plane without friction abou...

    Text Solution

    |

  8. A uniform metal rod of length L and mass M is rotating about an axis p...

    Text Solution

    |

  9. A gymnast standing on a rotating stool with his arms outstretched, sud...

    Text Solution

    |

  10. Angular momentum of the particle rotating with a central force is con...

    Text Solution

    |

  11. Solid sphere, hollow sphere, solid cylinder and hollow cylinder of sam...

    Text Solution

    |

  12. Solid sphere, hollow sphere, solid cylinder and hollow cylinder of sam...

    Text Solution

    |

  13. In the case of following rolling body translatory and rotational kinet...

    Text Solution

    |

  14. A disc is rolling (without slipping) on a horizontal surface. C is its...

    Text Solution

    |

  15. A particle performing uniform circular motion gas angular momentum L. ...

    Text Solution

    |

  16. If V is velocity of centre of mass of a rolling body then velocity of ...

    Text Solution

    |

  17. If the velocity of centre of mass of a rolling body is V then velocity...

    Text Solution

    |

  18. If x is ratio of rotational kinetic energy and translational kinetic e...

    Text Solution

    |

  19. A body is freely rolling down on an inclined plane whose angle of incl...

    Text Solution

    |

  20. A child is standing with folded hands at the center of a platform rota...

    Text Solution

    |