Home
Class 12
PHYSICS
The rotational kinetic energy of a body ...

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

A

`0.5 E`

B

`0.2 E`

C

`E`

D

`2E`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

    MOTION|Exercise Exercise - 2|40 Videos

  • ROTATIONAL MOTION

    MOTION|Exercise Exercise - 3 ( Section-A )|46 Videos

  • ROTATIONAL MOTION

    MOTION|Exercise Exercise - 3 ( Section-B )|24 Videos

  • RAY OPTICS

    MOTION|Exercise Exercise-4|38 Videos

  • SEMI CONDUCTOR AND LOGIC GATES

    MOTION|Exercise EXERCISE 3|34 Videos
MOTION-ROTATIONAL MOTION -Exercise - 1
  1. The rotational kinctic energy of a body rotating about proportional to

    Text Solution

    |

  2. When different regular bodies roll down along an inclined plane from r...

    Text Solution

    |

  3. A solid cylinder starts rolling from a height h on an inclined plane. ...

    Text Solution

    |

  4. A ring of mass 1kg and diameter 1m is rolling on a plane road with a s...

    Text Solution

    |

  5. A disc is rolling without slipping. The ratio of its rotational kineti...

    Text Solution

    |

  6. A cylinder of mass M and radius R rolls on an inclined plane. The gain...

    Text Solution

    |

  7. A hoop having a mass of 1kg and a diameter of 1 meter rolls along a le...

    Text Solution

    |

  8. The condition that a rigid body is rolling without slipping on an incl...

    Text Solution

    |

  9. The acceleration down the plane of spherical body of mass m radius R a...

    Text Solution

    |

  10. A sphere rolls down an inclined plane through a height h. Its velocity...

    Text Solution

    |

  11. The linear and angular acceleration of a particle are 10 m/"sec"^(2) a...

    Text Solution

    |

  12. A ring and a solid sphere of same mass and radius are rotating with th...

    Text Solution

    |

  13. For rotational motion, the Newton's second law of motion is indicated ...

    Text Solution

    |

  14. The rotational kinetic energy of a body is E. In the absence of extern...

    Text Solution

    |

  15. A ring is rolling without slipping. Its energy of translation is E. It...

    Text Solution

    |

  16. In the above question, if the disc executes rotatory motion, its angul...

    Text Solution

    |

  17. Rotational power in rotational motion is -

    Text Solution

    |

  18. A disc rolls down a plane of length L and inclined at angle theta, wit...

    Text Solution

    |

  19. A spherical shell and a solid cylinder of same radius rolls down an in...

    Text Solution

    |

  20. A disc of mass M and radius R rolls on a horizontal surface and then r...

    Text Solution

    |