Home
Class 12
PHYSICS
A thin horizontal circular disc is rotat...

A thin horizontal circular disc is rotating about a vertical axis passing throulgh its centre. An insect is at rest at a point near the rim of disc..The insect now moves along a diameter of the disc to reach its other end.During the journey of the insect, the angular speed of the disc

A

remains uncharged

B

continuously decreases

C

continuously increases

D

first increases and then decreases

Text Solution

Verified by Experts

The correct Answer is:
D
From angular momentum conservation about vertical axis passing through centre: When insect is coming from circumference to centre, moment of inertia decreases and when insect is going from centre to circumference, moment of inertia increases. So angular velocity first increases and then decreases.
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive) (SINGLE OPTION CORRECT TYPE)|26 Videos

  • ROTATIONAL MOTION

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive) (MULTIPLE OPTIONS CORRECT TYPE)|17 Videos

  • ROTATIONAL MOTION

    VMC MODULES ENGLISH|Exercise LEVEL - 2 (Angular Momentum, Collision)|20 Videos

  • REVISION TEST-2 JEE

    VMC MODULES ENGLISH|Exercise PHYSICS|25 Videos

  • SIMPLE HARMONIC MOTION

    VMC MODULES ENGLISH|Exercise 7-previous year question|46 Videos

Similar Questions

Explore conceptually related problems

A thin horizontal circular disc is roating about a vertical axis passing through its centre. An insect is at rest at a point near the rim of the disc. The insect now moves along a diameter of the disc to reach its other end. During the journey of the insect, the angular speed of the disc.

A horizontal disc is rotating about a vertical axis passing through its centre. If an insect moves from centre to rim then the angular momentum of the system

The moment of inertia of a copper disc, rotating about an axis passing through its centre and perpendicular to its plane

A disc is free to rotate about a smooth horizontal axis passing through its centre of mass. A particle is fixed at the top of the disc. A slight push is given to the disc and it starts rotating. During the process.

Radius of gyration of a uniform circular disc about an axis passing through its centre of gravity and perpendicular to its plane is

A disc of mass 4 kg and radius 6 metre is free to rotate in horizontal plane about a vertical fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small blocks of masses 2 kg each are placed in it on either side of the centre of the disc as shown in figure. The disc is given initial angular velocity omega_(0) =12 rad/sec and released. Find the angular speed of disc (in radian/sec) when the blocks reach the ends of the disc.

A disc of mass m and radius R is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m//2 each are placed in it on either side of the centre of the disc as shown in Fig. The disc is given an initial angular velocity omega_(0) and released. The angular speed of the disc when the balls reach the end of the disc is

A disc of mass m and radius R is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m//2 each are placed in it on either side of the centre of the disc as shown in Fig. The disc is given an initial angular velocity omega_(0) and released. The speed of each ball relative to the ground just after they leave the disc is

If a circular concentric hole is made on a disc then about an axis passing through the centre of the disc and perpendicular to its plane

A man of mass m stands on a horizontal platform in the shape of a disc of mass m and radius R , pivoted on a vertical axis thorugh its centre about which it can freely rotate. The man starts to move aroung the centre of the disc in a circle of radius r with a velocity v relative to the disc. Calculate the angular velocity of the disc.

VMC MODULES ENGLISH-ROTATIONAL MOTION -JEE MAIN (ARCHIVE)
  1. A thin uniform rod of length l and mass m is swinging freely about a h...

    Text Solution

    |

  2. A small paricle of mass m is projected at an angle theta with the x-ax...

    Text Solution

    |

  3. A thin horizontal circular disc is rotating about a vertical axis pass...

    Text Solution

    |

  4. A pulley os radius 2m is rotated about its axis by a force F= (20 t- ...

    Text Solution

    |

  5. A hoop of radius r and mass m rotating with an angular velocity omega(...

    Text Solution

    |

  6. A bob of mass m attached to an inextensible string of length l is susp...

    Text Solution

    |

  7. A mas m hangs with help of a string wraped around a pulley on a fricti...

    Text Solution

    |

  8. A mass ‘m’ is supported by a massless string wound around a uniform ho...

    Text Solution

    |

  9. From a solid sphere of mass M and radius R a cube of maximum possible ...

    Text Solution

    |

  10. Seven identical circular planar disks, each of mass M and radius R are...

    Text Solution

    |

  11. From a uniform circular disc of radius R and mass 9M, a small disc of ...

    Text Solution

    |

  12. A thin circular plate of mass M and radius R has its density varying a...

    Text Solution

    |

  13. A rectangle solid box of length 0.3m is held horizontally , with one o...

    Text Solution

    |

  14. A solid sphwere and solid cylinder of identical radii approach an incl...

    Text Solution

    |

  15. The following bodies are made to roll up (without slipping) the same i...

    Text Solution

    |

  16. A stationary horizontal disc is free to rotate about its axis. When a ...

    Text Solution

    |

  17. A thin smooth rod of length L and mass M is rotating freely with angul...

    Text Solution

    |

  18. Moment of inertia of a body about a given axis is 1.5 kg m^(2). Intial...

    Text Solution

    |

  19. A thin disc of mass M and radius R has mass per unit area sigma( r)=kr...

    Text Solution

    |

  20. The coordinates of a particle of mass 'm' as function of time are give...

    Text Solution

    |