Home
Class 12
PHYSICS
A fly wheel of M.I. 0.32 kg m^(2) is rot...

A fly wheel of M.I. `0.32 kg m^(2)` is rotated steadily at 120 rad/s by 50 w electric motor. Then the value of the frictional couple opposing rotation is,

A

0.025 Nm

B

0.42 Nm

C

0.042 Nm

D

0.25 Nm

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER 2019

    TARGET PUBLICATION|Exercise MCQ|45 Videos

  • SEMICONDUCTORS

    TARGET PUBLICATION|Exercise Evaluation Test|17 Videos

Similar Questions

Explore conceptually related problems

A flywheel of moment of inertia 5.0 kg m^2 is rotated at a speed of 60 rad/s. Because of the frictionat te axle, it comes to rest in 5.0 minutes. Find a. The average torque of the friction. B. the total work done by the friction and c. the angular momentum of the wheel 1 minute before it stops rotating.

A fly wheel of M.I. 6xx10^(-2) kgm^(2) is rotating with an angular velocity of 20 rad s^(-1) . The torque required to bring it to rest in 4s is

A flywheel of moment of inertia 5.0kg-m^(2) is rotated at a speed of 10rad//s because of the friction at the axis it comes to rest in 10s. Find the average torque of the friction.

A whel of M.I. = 1 kg-m^(2) is rotating at an angular speed of 40 rad/s. Due to friction on the axis, the wheel comes to rest in 10 minute. What is the angular momentum of the wheel in kg m^(2)//s two minutes before it comes to rest ?

A disc of moment of inrtia 20 kg . m^(2) is rotated about its transverse symmetry axis at 120 rpm by an electric motor of power 62.84 watts. When the motor is switched off, how many rotations does it complete before coming to rest ?

A wheel with moment of inertia 10 kg m^(2) is rotating at (2//pi) rps on its axis. The frictional torque acting on it, if it makes 20 rotations befor stopping is

A flywheel of moment of inertia 2 "kg-m"^(2) is rotated at a speed of 30 "rad/s" . A tangential force at the rim stops the wheel in 15 second. Average torque of the force is

A wheel having moment of inertia 12 kg m^(2) about its axis, rotates at 50 rpm about this axis.Then the torque that can stop the wheel in one minute is in (SI units) is (pi)/(N) .Then the value of N is ?

A flywheel of moment of inertia 10kg m^(2) is rotating at 50 rad//s . It must be brought to stop in 10 s . (a) How much work must be done to stop it? (b) What is the required average power?

A wheel at rest has M.I. 2/(pi^2) kgm^2 . It is rotated by a 60W motor for one minute. The number of rotations made by the wheel in one minute is

TARGET PUBLICATION-ROTATIONAL MOTION -MCQ
  1. If a constant torque of 500 Nm turns a wheel of moment of inertia 100 ...

    Text Solution

    |

  2. A torque of magnitude 2000 Nm acting on a body produces an angular acc...

    Text Solution

    |

  3. A fly wheel of M.I. 0.32 kg m^(2) is rotated steadily at 120 rad/s by ...

    Text Solution

    |

  4. A motor rotates at a constant speed of 25 rev/s. The power delivered b...

    Text Solution

    |

  5. A sphere cannot roll on

    Text Solution

    |

  6. Which of the following conditions is true for a rigid body rolling wit...

    Text Solution

    |

  7. A solid sphere of mass 10 kg and diameter 5 cm rolls without slipping ...

    Text Solution

    |

  8. A solid sphere at the top of an inclined plane 0.6 m high is released ...

    Text Solution

    |

  9. A thin uniform circular ring is rolling down an inclined plane of incl...

    Text Solution

    |

  10. Which of the following statements is true in case of the principle of ...

    Text Solution

    |

  11. State and prove theorem of perpendicular axes.

    Text Solution

    |

  12. State and prove theorem of parallel axes.

    Text Solution

    |

  13. M.I. of a thin uniform circular disc about one of the diameters is I. ...

    Text Solution

    |

  14. The moment of inertia of a circular loop of radius R, at a distance of...

    Text Solution

    |

  15. A solid cylinder of mass M and radius R rolls without slipping on a fl...

    Text Solution

    |

  16. The moment of inertia of a cylinder of radius R, length L and mass M a...

    Text Solution

    |

  17. Three uniform thin rods, each of mass 1 kg and length sqrt3\ m, are pl...

    Text Solution

    |

  18. Two spheres of equal masses, one of which is a thin spheical shelll an...

    Text Solution

    |

  19. Angular momentum of a body is the product of

    Text Solution

    |

  20. Direction of angular momentum of rotating body in vertical plane is

    Text Solution

    |