Home
Class 11
PHYSICS
A wheel rotating at an angular speed of ...

A wheel rotating at an angular speed of 20 rad/s ils brought to rest by a constant trouque in 4.0 secons. If the moiment of inertia of the wheel about the axis of rotation is 0.20 `kg-m^2` find the work done by the torque in the first two seconds.

A

`50 J`

B

`30 J`

C

`20 J`

D

`10 J`

Text Solution

Verified by Experts

The correct Answer is:
B
`tau=(Iomega)/t,W=tau theta`
Promotional Banner

Topper's Solved these Questions

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-III|66 Videos

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise NCERT based questions|15 Videos

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-1(C.W.)|64 Videos

  • PHYSICAL WORLD

    NARAYNA|Exercise C.U.Q|10 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    NARAYNA|Exercise EXERCISE - IV|39 Videos

Similar Questions

Explore conceptually related problems

A wheel rotating at a speed of 120 rpm about its axis is brought to rest by applying a constant torque for 4 s . Find the number of revolutions completed by the wheel before stop.

A flywheel rotating about a fixed axis has a kinetic energy of 360J when its angular speed is 30 radian s^(-1) . The moment of inertia of the wheel about the axis of rotation is

A fly wheel rotating about a fixed axis has a kinetic energy of 360 J . When its angular speed is 30 rad s^(-1) . The moment of inertia of the wheel about the axis of rotation is

A body rotating about a fixed axis has a kinetic energy of 360 J when its angular speed is 30 rad/sec. The moment of inertia of the wheel about its axis of rotation is

A wheel of mass 5 kg and radius 0.40 m is rolling on a road without sliding with angular velocity 10 rad s^-1 . The moment of ineria of the wheel about the axis of rotation is 0.65 kg m^2 . The percentage of kinetic energy of rotate in the total kinetic energy of the wheel is.

A constant net torque equal to 20 N-m is exerted on a pivoted wheel for 8 sec, during which time the angular velocity of the wheel increases from zero to 100 re // min. The external torque is then removed and the wheel is brought to rest by friction in its bearings in 70 sec. Compute (a) the moment of inertia of the wheel about the rotation axis, (b) the friction torque(c)thetotal no. of revolutions made by the wheel in the70 sec time interval

An autmobile moves on road with a speed of 54 km//h . The radius of its wheel is 0.45 m and the moment of inertia of the wheel about its axis of rotation is 3 kg m^(2) . If the vehicle is brought to rest in 15 s , the magnitude of average torque tansmitted by its brakes to the wheel is :

A torque of 100 N-m acting on a wheel at rest, rotates it through 200 radian in 10 s. What is the moment of inertia of the wheel?

NARAYNA-SYSTEM OF PARTICLES-Level-II(C.W.)
  1. The radius of gyration of rod of length L and mass M about an axis per...

    Text Solution

    |

  2. Two point size bodies of masses 2kg, 3kg are fixed at two ends of a li...

    Text Solution

    |

  3. Three rings, each of mass m and radius r, are so placed that they touc...

    Text Solution

    |

  4. Three point sized bodies each of mass M are fixed at three corners of ...

    Text Solution

    |

  5. A thin uniform circular disc of mass M and radius R is rotating in a h...

    Text Solution

    |

  6. A turn table is rotating in horizontal plane about its own axis at an ...

    Text Solution

    |

  7. A uniform cylindrical rod of mass m and length L is rotating with an a...

    Text Solution

    |

  8. A constant torque of 1000 N-m turns a wheel of moment of inertia 200 k...

    Text Solution

    |

  9. An energy of 484 J is spent in increasing the speed of a flywheel from...

    Text Solution

    |

  10. The angular frequency of a fan of moment of inertia 0.1kgm^2 is increa...

    Text Solution

    |

  11. A wheel rotating at an angular speed of 20 rad/s ils brought to rest b...

    Text Solution

    |

  12. A sphere of mass m and radius r rolls on a horizontal plane without sl...

    Text Solution

    |

  13. A circular ring starts rolling down on an inclined plane from its top....

    Text Solution

    |

  14. A thin rod of length L is vertically straight on horizontal floor. Thi...

    Text Solution

    |

  15. A wheel of radius R rolls without slipping on the horizontal surface w...

    Text Solution

    |

  16. A solid cylinder of mass m rolls without slipping down an inclined pla...

    Text Solution

    |

  17. A thin metal disc of radius 0.25m and mass 2kg starts from rest and ro...

    Text Solution

    |

  18. A small solid cylinder of radius r is released coaxially from point A ...

    Text Solution

    |

  19. A metal disc of radius R and mass M freely rolls down from the top of ...

    Text Solution

    |

  20. A thin rod of length L is vertically straight on horizontal floor. Thi...

    Text Solution

    |