Home
Class 11
PHYSICS
A child is standing with folded hands at...

A child is standing with folded hands at the centre of a platform rotating about its central axis. The K.E of the system is K. The child now stretches his arms so that the M.I of the system doubles. The K.E of the system now is

A

`2K`

B

`K//2`

C

`4K`

D

`K//4`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    AAKASH SERIES|Exercise PRACTICE EXERCISE|99 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    AAKASH SERIES|Exercise Exercise-I|143 Videos

  • SURFACE TENSION

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (PRACTICE SHEET (ADVANCED) INTEGER TYPE QUESTIONS )|8 Videos

  • THERMAL PROPERTIES OF MATTER

    AAKASH SERIES|Exercise ADDITIONAL PRACTICE EXERCISE (LEVEL - II) PRACTICE SHEET (ADVANCED) Integer/Subjective Type Questions|2 Videos

Similar Questions

Explore conceptually related problems

A ballet dancer spins about a vertical axis at 60 rpm with his arms closed. Now he stretches his arms such that M.I increases by 50%. The new speed of revolution is

Two identical rods each of moment of inertia .I. about a normal axis through centre are arranged in the from of a cross. The M.I. of the system about an axis through centre and perpendicular to the plane of system is

AAKASH SERIES-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-Exercise-II
  1. A thin wire of length l having linear density rho is bent into a circu...

    Text Solution

    |

  2. If the mass of earth and radius suddenly become 2 times and 1/4 th of ...

    Text Solution

    |

  3. A child is standing with folded hands at the centre of a platform rota...

    Text Solution

    |

  4. A ballet dancer spins about a vertical axis at 60 rpm with his arms cl...

    Text Solution

    |

  5. A circular disc is rotation about its natural axis with angular veloci...

    Text Solution

    |

  6. A shell of mass of mass 'm' is projected with a velocity 'v' at an ang...

    Text Solution

    |

  7. Density remaining constant, if earth contracts to half of its present ...

    Text Solution

    |

  8. Two wheels of M.I. 3kgm^(2) and 5kgm^(2) are rotating at a rate of 600...

    Text Solution

    |

  9. A mass is whirled in a circular path with an angular momentum L. If th...

    Text Solution

    |

  10. If a disc of mass m and radius R totates with an angular acceleration ...

    Text Solution

    |

  11. A merry-go-round, made of a ring-like platform of radius R and mass M ...

    Text Solution

    |

  12. The diameter of a rotating fly wheel is R. Its coefficient of linear e...

    Text Solution

    |

  13. Keeping the mass of earth as constant, if its radius is reduced to 1//...

    Text Solution

    |

  14. A uniform circular disc of radius 50cm at rest is free to turn about a...

    Text Solution

    |

  15. The handle of a door is at a distance 40 cm from axis of rotation. If ...

    Text Solution

    |

  16. A particle of mass m is projected with an initial velocity u at an ang...

    Text Solution

    |

  17. A constant torque of 1000 N-m, turns á wheel of moment of inertia 200 ...

    Text Solution

    |

  18. If 484J of energy is spent in increasing the speed of wheel from 60 rp...

    Text Solution

    |

  19. A shaft rotating at 3000 rpm is transmitting a power of 3.14 KW. The m...

    Text Solution

    |

  20. A wheel rotating at angular speed of 20rads^(-1), is brought to rest b...

    Text Solution

    |