Home
Class 12
PHYSICS
A coins kept on a horizontal rotating di...

A coins kept on a horizontal rotating disc has its centre at a distance of 0.25 m from the axis of rotation of the disc .If `mu is 0.2`, then the angular velocity of the disc at which the coion will slip off, `(g=9.8m//s^(2))`

A

`3.8 rad//s`

B

`2.8 rad//s`

C

`4.8 rad//s`

D

`5.8 rad//s`

Text Solution

Verified by Experts

The correct Answer is:
B
`v=sqrt(mu g r )`
`therefore r omega =sqrt mu g r `
`therefore omega = sqrt (mu g)/(r)`
Promotional Banner

Topper's Solved these Questions

  • ATOMS, MOLECULES AND NUCLEI

    NIKITA PUBLICATION|Exercise MCQs|443 Videos

  • COMMUNICATION SYSTEMS

    NIKITA PUBLICATION|Exercise Multiple Choice Questions (Examples for Practice)|8 Videos

Similar Questions

Explore conceptually related problems

A coin kept on a rotating gramophone disc just beging to slip if its centre is at a distance of 8 cm from the centre of the disc .The angular velocity of the gramophone disc is then doubled , Through what distance , the coin should be shifted towards the centre , so that the coin will just slip ?

A coin of 4 g mass is placed at a distance of 2 cm from the axis of rotation a disc,. If the frequancy of disc is 180 rpm, then the coefficient of friction between the coin at rest and disc will be

A small coin is kept at the rim of a horizontal circular disc which is set into rotation about verticle axis passing through its centre. If radius of the disc is 5 cm and mu_(s)=0.25 , then the angular speed at which the coin will just slip off at

A coin placed on a horizontal rotating disc, with its centre at 10 cm from the centre of the disc, is about to slip off when the disc performs 60 rpm. Find the coefficient of friction between the coin and the disc.

A body is kept on a horizontal disc of radius 2 m at a distance of 1 m from the centre . The coefficient of friction between the body and the surface of disc is 0.4. The speed of rotation of the disc at which the body starts slipping is (g=10 m//s^2 )

A coin just remains on a disc rotating at a steady rate of 180r.p.m .A coin is kept at a distance of 2 cm from the axis of rotationn . The coefficient of fricition between the coin and the disc is _____ [ gg= 9.8 m//s^(2)]

A small coin is kept at the rim of a horizontal circular disc which is set into rotation about vertical axis passing through its centre . If radius of the disc is 10 cm and mu_(s) = (3)/(7) , then the angular speed at which the coin will just slip off at

A coin placed on a rotating gramophone disc, remains at rest when it is at a distance of 9 cm from its centre ,the angular velocity of the disc is then tripled .At what distance from the centre ,the coin should be placed , so that it will remain at rest ?

A disc rotates about its aixs of symmetry in a horizontal plane at a steady rate of 3.5 revolutions per second A coin placed at a distance fo 1.25 cm form the axis of ratation remains at rest on the disc The coefficient of friction between the coin and the disc is : (g=10//s^(2))

A disc rotates horizontal at the rate of 100 rpm and M.I. of the disc about the axis of rotation is 1kg m^(2) . If a blob of molten wax weighing 50 gm drops gently at a distance 20 cm from the axis of rotation of the disc and remains stuck to it, then the increase in moment of inertia of the system will be

NIKITA PUBLICATION-CIRCULAR MOTION-Multiple Choice Question
  1. The maximum speed of a car which can be safely driven along a curve of...

    Text Solution

    |

  2. At a curved path of a road, the road bed is raised the curved path, th...

    Text Solution

    |

  3. A coins kept on a horizontal rotating disc has its centre at a distanc...

    Text Solution

    |

  4. A vehicle moves on a horizontal curved road of radius of curvature 50 ...

    Text Solution

    |

  5. The height of the centre of gravity of the truck above the ground is 1...

    Text Solution

    |

  6. The radius of curvature of a metre gauge railway line at a place where...

    Text Solution

    |

  7. A cyclist is riding with a speed of 27 km h^(-1). As he approaches a c...

    Text Solution

    |

  8. A car is moving with speed of 10 m//s in a concave road of radius 10...

    Text Solution

    |

  9. A road is banked with an angle 0.01 radian .If the radiaus of the road...

    Text Solution

    |

  10. The maximum safe speed of a vehicle over a curved road of radius 150 m...

    Text Solution

    |

  11. The maximum safe speed of a vehicle on a circulartrack is 15km//h . Wh...

    Text Solution

    |

  12. A curved road of 50m in radius is banked to correct angle for a given ...

    Text Solution

    |

  13. A motorcycle is travelling on a curved track of radius 500 m. If the c...

    Text Solution

    |

  14. When the road is dry and the coefficient of friction is mu, the maximu...

    Text Solution

    |

  15. A person stands in contact against a wall of cylindrical drum of radiu...

    Text Solution

    |

  16. A car is moving in a circular horizontal track of radius 10 m with a c...

    Text Solution

    |

  17. A road is 10 m wide. Its radius of curvature is 50 m . The outer edge ...

    Text Solution

    |

  18. A circular road of radius 1000 m has banking angle 45^@. IF the coeffi...

    Text Solution

    |

  19. An unbanked curve has a radius of 60m. The maximum speed at which a ca...

    Text Solution

    |

  20. A 100 kg car is moving with a maximum velocity of 9 m//s across a circ...

    Text Solution

    |