Home
Class 12
PHYSICS
A disc is rotating with angular velocity...

A disc is rotating with angular velocity `hatomega` about its axis. A force `vecF` acts at a point whose position vector with respect to the axis of rotation is `vecr`. The power associated with the torque due to the force is given by

A

0 m/s

B

`20sqrt(2)` m/s

C

`20sqrt(3)` m/s

D

40 m/s

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • RACE

    ALLEN|Exercise Basic Maths (CIRCULAR MOTION)|17 Videos

  • RACE

    ALLEN|Exercise Basic Maths (COLLISION AND CENTRE OF MASS )|12 Videos

  • RACE

    ALLEN|Exercise Basic Maths (FRICTION)|14 Videos

  • NEWTONS LAWS OF MOTION

    ALLEN|Exercise EXERCISE-III|28 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Example|1 Videos

Similar Questions

Explore conceptually related problems

A disc is rotating with angular velocity omega . A force F acts at a point whose position vector with respect to the axis of rotation is r. The power associated with torque due to the force is given by

A disc is rotating with angular velocity omega . A force F acts at a point whose position vector with respect to the axis of rotation is r. The power associated with torque due to the force is given by

A rod is rotating with angular velocity omega about axis AB. Find costheta .

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

A solid sphere is rotating with a constant angular velocity about an axis touching the surface. Its angular momentum will be:

A force vec(F)=4hati-10 hatj acts on a body at a point having position vector -5hati-3hatj relative to origin of co-ordinates on the axis of rotation. The torque acting on the body is

A circular loop of rope of length L rotates with uniform angular velocity omega about an axis through its centre on a horizontal smooth platform. Velocity of pulse (with resppect to rope ) produce due to slight radiul displacement is given by

A circular loop of rope of length L rotates with uniform angular velocity omega about an axis through its centre on a horizontal smooth platform. Velocity of pulse (with resppect to rope ) produce due to slight radiul displacement is given by

Find the torque of a force (7 hati + 3hatj - 5hatk) about the origin. The force acts on a particle whose position vector is (hati - hatj + hatk) .

A metal disc of radius R rotates with an angular velcoity omega about an axis perpendiclar to its plane passing through its centre in a magnetic field B acting perpendicular to the plane of the disc. Calculate the induced emf between the rim and the axis of the disc.

ALLEN-RACE-Basic Maths (WORK POWER & ENERGY)
  1. A block of mass m is released on the top of a smooth inclined plane of...

    Text Solution

    |

  2. A particle of mass 0.1 kg is subjected to a force which varies with di...

    Text Solution

    |

  3. An unloaded bus can be stopped by applying brakes on straight road aft...

    Text Solution

    |

  4. A body of mass m, accelerates uniformly from rest to V(1) in time t(1)...

    Text Solution

    |

  5. A car of mass m has an engine which can deliver power P, The minimum t...

    Text Solution

    |

  6. The rate of doing work by force acting on a particle moving along x - ...

    Text Solution

    |

  7. An object starts from rest and is acted upon by a variable force F as ...

    Text Solution

    |

  8. Which of the following force is not conservative :-

    Text Solution

    |

  9. A disc of mass m and radius r is free to rotate about its centre as sh...

    Text Solution

    |

  10. A particle of mass m is projected with speed u at an angle theta with ...

    Text Solution

    |

  11. A cubical block of mass m and edge a slides down a rough inclned plane...

    Text Solution

    |

  12. The torpue of force vecF=-2hati+2hatj+3hatk acting on a point vecr=hat...

    Text Solution

    |

  13. Moment of a force of magnitude 20 N acting along positive x-direction ...

    Text Solution

    |

  14. A disc is rotating with angular velocity hatomega about its axis. A fo...

    Text Solution

    |

  15. When a torque acting upon a system is zero. Which of the following wil...

    Text Solution

    |

  16. Two men support a uniform rod of mass M and length L at its two ends. ...

    Text Solution

    |

  17. The thin rod shown below has mases M and length L. A force F acts at o...

    Text Solution

    |

  18. Two equal and opposite forces F are allplied tangentially to a uniform...

    Text Solution

    |

  19. A wheel having moment of inertia 4 kg m^(2) about its symmetrical axis...

    Text Solution

    |

  20. For equilibrium of the system, value of mass m should be

    Text Solution

    |