Home
Class 12
PHYSICS
A circular platform is mounted on a fric...

A circular platform is mounted on a frictionless vertical axle. Its radius `R = 2m` and its moment of inertia about the axle is `200 kg m^(2)`. It is initially at rest. A `50 kg` man stands on the edge at the platform and begins to walk along the edge at the speed of `1ms^(-1)` relative to the ground. Time taken by the man to complete one revolution is :

A

`(3 pi)/2 s`

B

`2 pi s`

C

`pi/2 s`

D

`pi s`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

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

  • ROTATIONAL MOTION

    MOTION|Exercise Exercise - 2|40 Videos

  • RAY OPTICS

    MOTION|Exercise Exercise-4|38 Videos

  • SEMI CONDUCTOR AND LOGIC GATES

    MOTION|Exercise EXERCISE 3|34 Videos

Similar Questions

Explore conceptually related problems

A circular platform is mounted on a vertical frictionless axle. Its radius is r = 2 m and its moment of inertia I = 200 kg m^2 . It is initially at rest. A 70 kg man stands on the edge of the platform and begins to walk along the edge at speed v_0 = 1 m s^-1 relative to the ground. The angular velocity of the platform is.

The moment of inertia of a circular disc about its diameter is 500 kg m^(2) . If its radius is 2 m, than its radius of gyration is

A turntable turns about a fixed vertical axis, making one revolution in 10 s . The moment of inertia of the turntable about the axis is 1200 kgm^(2) . A man of 80 kg , initially standing at centre of the turnable, runs out along the radius. What is the angular velocity of the turtable when the man is 2 m from the centre?

A solid cylinder of mass 20kg has length 1 m and radius 0.2 m. Then its moment of inertia (in kg- m^(2) ) about its geometrical axis is :

A man of mass 100 kg stands at the rim of a turtable of radius 2 m and moment of inertia 4000 kgm^(2) mounted on a vertical frictionless shaft at its centre. The whole system is initially at rest. The man now walks along the outer edge of the turntable with a velocity of 1m//s relative to the earth a. With what angular velocity and in what direction does the turntable rotate? b. Through what angle will it have rotated when the man reaches his initial position on the turntable? c. Through what angle will it have rotated when the man reaches his initial position relative to the earth?

MOTION-ROTATIONAL MOTION -Exercise - 3 ( Section-A )
  1. O is the centre of an equilateral triangle ABC. F(1), F(2) and F(3) ar...

    Text Solution

    |

  2. When a mass is rotating in a plane about a fixed point, its angular mo...

    Text Solution

    |

  3. The moment of inertia of a uniform circular disc is maximum about an a...

    Text Solution

    |

  4. A circular platform is mounted on a frictionless vertical axle. Its ra...

    Text Solution

    |

  5. Three masses are placed on the x-axis : 300 g at origin. 500 g at x = ...

    Text Solution

    |

  6. A thin hollow sphere of mass m is completely filled with a liquid of m...

    Text Solution

    |

  7. Assertion (A) Two circular discs of equal mass and thickness made of d...

    Text Solution

    |

  8. A rod of weight w is supported by two parallel knife edges A and B an...

    Text Solution

    |

  9. A mass m moves in a circles on a smooth horizontal plane with velocity...

    Text Solution

    |

  10. Three idential spherical shells each of mass m and radius r are placed...

    Text Solution

    |

  11. From a disc of radius R and mass m, a circular hole of diamter R, whos...

    Text Solution

    |

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

    Text Solution

    |

  13. A disc and a solid sphere of same radius but different masses roll off...

    Text Solution

    |

  14. A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm...

    Text Solution

    |

  15. Two discs of same moment of inertia rotating their regular axis passin...

    Text Solution

    |

  16. A solid sphere is in rolling motion. In rolling motion a body prossese...

    Text Solution

    |

  17. A solid sphere is rotating freely about its symmetry axis in free spac...

    Text Solution

    |

  18. There object, A : (a solid sphere), B : (a thin circular disk) and C :...

    Text Solution

    |

  19. Which one of the following statements is incorrect ?

    Text Solution

    |

  20. The moment of the force, vec F = 4 hati + 5 hat j - 6 hat k at (2, 0 ,...

    Text Solution

    |