Home
Class 11
PHYSICS
A man standing on a platform holds weigh...

A man standing on a platform holds weights in his outstretched arms. The system is rotated about a central vertical axis. If the man now pulls the weights inwards close to his body then

A

(`i`),(`ii`)

B

(`ii`),(`iii`)

C

(`ii`),(`iv`)

D

(`i`),(`iii`),(`iv`)

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

    CP SINGH|Exercise Exercise|172 Videos

  • RELATIVE MOTION

    CP SINGH|Exercise EXERCISE|33 Videos

  • SIMPLE HARMONIC MOTION

    CP SINGH|Exercise Exercises|125 Videos

Similar Questions

Explore conceptually related problems

A gymnast standing on a rotating stool with his arms outstretched, suddenly lowers his arms

A man is sitting on a rotating stool with his arms outstretched. If suddenly he folds his arms the angular velocity of the man would

A man is standing on a balance and his weight is measured. If he takes a step in the left side, then weight

A person is standing on a platform which executing vertical S.H.M. his weight be largest at

A man stands on a rotating platform, with his arms stretched horizontal holding a 5 kg weight in each hand. The angular speed of the platform is 30 revolutions per minute. The man then brings his arms close to his body with the distance of each weight from the axis changing from 90 cm to 20 cm . moment of inertia of the man together with the platform may be taken to be constant and equal t 7.6 kg m^(2) . (a) What is the his new angular speed ? (Neglect friction.) (b) Is kinetic energy conserved in the process ? If not, from where does the change come about ?

A child is standing with his two arms outstretched at the centre of a turntable that is rotating about its central axis with an angular speed omega_0 . Now, the child folds his hands back so that moment of inertia becomes 3 times the initial value. The new angular speed is.

A preson is standing on the centre of a rotating table with his arms outstretched. The table is rotating freely with an angular his hands towards his chest. The moment of inertia reduces to (3)/(5) time the original moment of inertia. Calculate angular speed of the man when he withdraws his hands.

In fig. the man and the platform together weight 950N. The pulley can be treated as frictionless. Determine how hard the man has to pull on the rope to lift himself upward above the ground with constant velocity. If the weight of man is 550 N, what is the normal reaction between them?

A student sits on a stool that is free to rotate about a vertical axis. He holds out his arms horizontally, with a 4-kg weight in each hand. The stool is set in rotation with angular speed of 0.5 revolution per second. Calcualate the angular speed of the student is 90 cm and his rotational inertia is 7kg m^(2) . [Hint: Use conservation principle]

A man stands at the centre of a circular table with his two hands outstretched. The table is set into rotation with an angular speed of 40 rev/min. What is the angular speed when the man folds his hands back and thereby reduces his moment of inertia 2/5 times the initial value? Assume that the table rotates without friction.

CP SINGH-ROTATIONAL MOTION-Exercise
  1. A thin horizontal circular disc is roating about a vertical axis passi...

    Text Solution

    |

  2. A circular plarform is free to rotate in a horizontal plane about a ve...

    Text Solution

    |

  3. A man standing on a platform holds weights in his outstretched arms. T...

    Text Solution

    |

  4. A small mass attached to a string rotates on a frictionless table top ...

    Text Solution

    |

  5. A stone of mass m tied to the end of a string, is whirled around in a ...

    Text Solution

    |

  6. A cubical block of side a is moving with velocity V on a horizontal sm...

    Text Solution

    |

  7. A playground merry-go-round is at rest, pivoted about a frictionless a...

    Text Solution

    |

  8. A small ball strikes a stationery uniform rod, which is free to rotate...

    Text Solution

    |

  9. Consider a body, shown in figure, consisting of two identical balls, e...

    Text Solution

    |

  10. A uniform bar of length 6a and mass 8m lies on a smooth horizontal tab...

    Text Solution

    |

  11. A small mass m is attached to a massless string whose other end is fi...

    Text Solution

    |

  12. A constant torque acting on a uniform circular wheel changes its anglu...

    Text Solution

    |

  13. A thin rod of mass m and length 2L is made to rotate about an axis pas...

    Text Solution

    |

  14. A constant external torque tau acts for a very brief period Delta t on...

    Text Solution

    |

  15. The torque vec tau on a body about a given point is found to be equal ...

    Text Solution

    |

  16. A wheel rolls without slipping on a horizontal surface such that its v...

    Text Solution

    |

  17. A solid disc rolls clockwise without slipping over a horizontal path w...

    Text Solution

    |

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

    Text Solution

    |

  19. A sphere is rolling without slipping on a fixed horizontal plane surfa...

    Text Solution

    |

  20. A string of negligible thicknes is wrapped several times around a cyli...

    Text Solution

    |