Home
Class 12
PHYSICS
The radius of gyration of flywheel is (3...

The radius of gyration of flywheel is `(3//pi)m` and its mass is 1 kg. If the speed of the flywheel is changed from 20 rpm to 60 rmp, then the work done would be

A

16 J

B

12 J

C

24 J

D

32 J

Text Solution

Verified by Experts

The correct Answer is:
A
Work done = Change in K.E.
`K.E. = (1)/(2)I (omega_(2)^(2)-omega_(1)^(2))`
`=(1)/(2)m k^(2)4 pi^(2)(n_(2)^(2)-n_(1)^(2))`
Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER - MH-CET 2018

    NIKITA PUBLICATION|Exercise MCQ|50 Videos

  • SEMICONDUCTORS

    NIKITA PUBLICATION|Exercise MCQS|350 Videos

Similar Questions

Explore conceptually related problems

A disc of moment of inertia 9.8//pi^(2)kg m^(2) is rotating at 600 rpm. If the frequency of rotation changes from 600 rpm to 300 rpm, then what is the work done ?

A disc of moment of inertia 9.8//pi^(2)kg m^(2) is rotating at 600 rpm . If the frequency of rotation changes from 600 rpm to 300 rpm, then what is the work done?

An energy of 484 J is spent in increasing the speed of a flywheel from 60 rpm to 360 rpm. Calculate moment of inertia of flywheel.

A body of mass 1 kg is lifted through a height of 1m, then its work done is

To increase the speed of a flywheel from 60 rpm to 360 rpm, energy of 490 J is spent. Calculate the moment of inertia of wheel.

When the speed of a flywheel is increased from 240 r.p.m. to 360 r.p.m., the energy spent is 1936 J. What is te moment of inertia of the flywheel?

The moment of inertia of a solid flywheel about its axis is 0.1 kg-m^(2) .A tangential force of 2 kg-wt. is applied round the circumference of the flywheel with the help of a string and mass arrangement as shown in the figure. If the radius of the wheel is 0.1 m, find the acceleration ("in rad/sec"^(2)) of the mass :

A body of mass 5kg undergoes a change in speed from 20 to 0.20 m/s. The momentum of the body would

NIKITA PUBLICATION-ROTATIONAL MOTION -MULTIPLE CHOICE QUESTIONS
  1. A ring and a disc having the same mass, roll without slipping with the...

    Text Solution

    |

  2. A flywheel is in the form of solid circular wheel of mass 72 kg and ra...

    Text Solution

    |

  3. The radius of gyration of flywheel is (3//pi)m and its mass is 1 kg. I...

    Text Solution

    |

  4. The radius of a wheel is R and its radius of gyration about its axis p...

    Text Solution

    |

  5. Two bodies with moment of inertia l(1) and l(2) (l(1) gt l(2)) have eq...

    Text Solution

    |

  6. The rotational kinetic energy of a body is E. In the absence of extern...

    Text Solution

    |

  7. Angular momentum of body changes by 80 kg m^(2)//s, when its angular v...

    Text Solution

    |

  8. A fly wheel rotating about a fixed axis has a kinetic energy of 360 J....

    Text Solution

    |

  9. A disc of moment of inertia 9.8//pi^(2)kg m^(2) is rotating at 600 rpm...

    Text Solution

    |

  10. If the variation of rotational kinetic energy E with the angular momen...

    Text Solution

    |

  11. A circular disc of mass 0.41 kg and radius 10 m rolls without slipping...

    Text Solution

    |

  12. If the angular momentum of a rotating body about an axis is increased ...

    Text Solution

    |

  13. If the kinetic energy of a rotating body about an axis is decreased by...

    Text Solution

    |

  14. A boy stands on a freely rotating platform with his arms extended. His...

    Text Solution

    |

  15. A rod of mass M and length l is suspended freely from its endandit...

    Text Solution

    |

  16. A hollow sphere rolls on a horozontal surface without slipping. Then ...

    Text Solution

    |

  17. A hollow cylinder open at both ends slides without rotating, and then ...

    Text Solution

    |

  18. The kinetic energy of a body rotating at 300 revolutions per minute is...

    Text Solution

    |

  19. The rotational kinetic energies of two flywheels are equal. If the rat...

    Text Solution

    |

  20. A uniform rod of length l is held vertically on a horizontal floor fix...

    Text Solution

    |