Home
Class 12
PHYSICS
If the radius of the earth contracts to ...

If the radius of the earth contracts to half of its present value without change in its mass, what will be the new duration of the day?

A

48h

B

24h

C

12h

D

6h

Text Solution

Verified by Experts

The correct Answer is:
D

`T_(2)=24 n^(2)`
Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER - MH-CET 2018

    NIKITA PUBLICATION|Exercise MCQ|50 Videos
  • SEMICONDUCTORS

    NIKITA PUBLICATION|Exercise MCQS|350 Videos

Similar Questions

Explore conceptually related problems

If radius of the earth contracts to half of its present value without change in its mass, what will be the new duration of the day?

If radius of the earth is doubled without change in its mass, what will be the length of the day?

If the earth were to suddenly contract to 1//n^(th) of its present radius without any change in its mass, the duration of the new day will be nearly

the escape velocity on a planet is v. if the radius of the planet contracts to 1/4 of the present value without any change in its mass, the escape velocity will be

If radius of earth becomes n times its present value, without change in mass, then duration of day becomes

If the earth suddenly contracts to one third of its present size without any change in its mass, the ratio of the kinetic energies of the earth after and before contraction will be

NIKITA PUBLICATION-ROTATIONAL MOTION -MULTIPLE CHOICE QUESTIONS
  1. A wheel of moment of inertia 5xx10^(-3) kg m^(2) is making 20 revoluti...

    Text Solution

    |

  2. A wheel is rotating with frequency of 500 rpm on a shaft, second ident...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  5. Two discs of moments of inertia I(1) and I(2) about their respective a...

    Text Solution

    |

  6. A ring of mass m and radius R is rolling on a horizontal plane. If the...

    Text Solution

    |

  7. A large disc has mass 2kg and radius 0.2 m and initial angular velocit...

    Text Solution

    |

  8. A man stands holding a weight in each hand and with his arms outstretc...

    Text Solution

    |

  9. A ballet dancer spins about a vertical axis at 120 rpm with arms out s...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  12. Angular momentum L and rotational kinetic energy KR of a body are rela...

    Text Solution

    |

  13. A torque of 50 Nm acts on a rotating body for 5 s. Its angular momentu...

    Text Solution

    |

  14. A thin uniform circular disc of mass M and radius R is rotating in a h...

    Text Solution

    |

  15. A body of mass 2 kg and radius of gyration 0.5 m is rotating about an ...

    Text Solution

    |

  16. Two rigid bodies with their moments of inertia in the ratio 2:3 have s...

    Text Solution

    |

  17. Two wheels A and B are mounted on the same axle. Moment of inertia of ...

    Text Solution

    |

  18. A particle of mass m is rotating in a plane in circular path of radius...

    Text Solution

    |

  19. If moment of inertia of a circular disc that makes 20 revolutions per ...

    Text Solution

    |

  20. If a uniform solid sphere of diameter 0.2 m and mass 10 kg is rotated ...

    Text Solution

    |