Home
Class 12
PHYSICS
A disc with moment of inertial I is rota...

A disc with moment of inertial I is rotating with some angular speed. Second disc is initially at rest. Now second disc with moment of inertia 3I is placed on first disc and starts rotating. Find loss of kinetic energy in fraction

A

`5/6`

B

`1/4`

C

0

D

`3/4`

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • JEE MAINS

    JEE MAINS PREVIOUS YEAR ENGLISH|Exercise Chemistry|1 Videos

Similar Questions

Explore conceptually related problems

A disc is rotating with angular speed omega_(1) . The combined moment of inertia of the disc and its axle is I_(1) . A second disc of moment of inertia I_(2) is dropped on to the first and ends up rotating with it. Find the angular velocity of the combination if the original angular velocity of the upper disc was (a) zero (b) omega_(2) in the same direction as omega_(1) and (c) omega_(2) in a direction opposite to omega_(1) .

A body is rotating with angular momentum L. If I is its moment of inertia about the axis of rotation is I, its kinetic energy of rotation is

A circular disc of moment of inertia I_(t) is rotating in a horizontal plane about its symmetry axis with a constant angular velocity omega_(i) . Another disc of moment of inertia I_(b) is dropped co-axially onto the rotating disc. Initially, the second disc has zero angular speed. Eventually, both the discs rotate with a constant angular speed omega_(f) . Calculate the energy lost by the initially rotating disc due to friction.

If a disc of moment of inertia I and radius r is reshaped into a ring of radius nr, keeping its mass same, its moment of inertia becomes

Two uniform circular rough disc of moment of inertia I_(1) and (I_(1))/(2) are rotating with angular velocity omega_(1) and (omega_(1))/(2) respectively in same direction. Now one disc is placed the other disc co-axially. The change in kinetic energy of the system is :

A uniform disc of moment of inertia 1 kg m^2 rotates with a speed of 120 rpm, Calculate the torque required to stop the disc in 10 revolutions ?

Moment of inertia of a disc about an axis which is tangent and parallel to its plane is I . Then the moment of inertia of disc about a tangent, but perpendicular to its plane will be

The two uniform discs rotate separately on parallel axles. The upper disc (radius a and momentum of inertia I_1 ) is given an angular velocity omega_0 and the lower disc of (radius b and momentum of inertia I_2 ) is at rest. Now the two discs are moved together so that their rims touch. Final angular velocity of the upper disc is. .

In the above question, angular displacement of the disc, in first two second will be in radian:

Two discs, each having moment of inertia 5 kg m^(2) . about its central axis, rotating with speeds 10 rad s^(-1) and 20 rad s^(-1) , are brought in contact face to face with their axes of rotation coincided. The loss of kinetic energy in the process is

JEE MAINS PREVIOUS YEAR ENGLISH-JEE MAINS 2020-PHYSICS
  1. Acceleration due to gravity is same when an object is at height R/2 fr...

    Text Solution

    |

  2. A solid shere of radius R carries a charge Q distributed uniformly ov...

    Text Solution

    |

  3. A disc with moment of inertial I is rotating with some angular speed. ...

    Text Solution

    |

  4. For a concave mirror

    Text Solution

    |

  5. Three different processes that can occur in an ideal monoatomic gas ar...

    Text Solution

    |

  6. Number of molecules in a volume of 4 cm^3 of a perfect monoatomic gas ...

    Text Solution

    |

  7. A square loop of side 2a and carrying current I is kept in xz plane wi...

    Text Solution

    |

  8. A physical quantity z depends on four observables a, b, c and d, as z ...

    Text Solution

    |

  9. A shell of relative density 27/9 w.r.t water is just submerged in wat...

    Text Solution

    |

  10. In a resonance tube experiment when the tube is filled with water up t...

    Text Solution

    |

  11. An electrical power line, having a total resistance of 2Omega, deliver...

    Text Solution

    |

  12. A bullet of mass 5 g travelling with a speed of 210 m/s, strikes a fix...

    Text Solution

    |

  13. A force vecF = (hati + 2hatj +3hatk)N acts at a point (4hati + 3hatj -...

    Text Solution

    |

  14. A beam of electrons of energy E scatters from a target having atomic s...

    Text Solution

    |

  15. A particle of mass 220 meV//c^2 collides with a hydrogen tom at rest. ...

    Text Solution

    |

  16. A compound microscope consists of an objective lens of focal length 1 ...

    Text Solution

    |

  17. Two concentric circular coils, C1 and C2, are ploced in the XY plane. ...

    Text Solution

    |

  18. A screw gauge has 50 divisions on its circular scale. The circular sca...

    Text Solution

    |

  19. A sound source S is moving along a straight track with speed v, and is...

    Text Solution

    |

  20. Fig, here shows P and Q as two equally intense coherent sources emitti...

    Text Solution

    |