Home
Class 11
PHYSICS
A mass is supported on a frictionless ho...

A mass is supported on a frictionless horizontal surface. It is attached to a string and rotates about a fixed centre with a angular velocity `omega_(0)`. If the length of the string and angular velocity are doubled, the tension in the string which was initially `T_(0)` is now

A

`T_(0)`

B

`T_(0)//2`

C

`4T_(0)`

D

`8T_(0)`

Text Solution

Verified by Experts

The correct Answer is:
D
`T_(0)=m omega^(2)l`
`T=m(2omega)^(2)xx2l=8T_(0)`
Promotional Banner

Topper's Solved these Questions

  • CENTRE OF MASS

    RESONANCE ENGLISH|Exercise Exercise|38 Videos

  • COMMUNICATION SYSTEM

    RESONANCE ENGLISH|Exercise Exercise|30 Videos

Similar Questions

Explore conceptually related problems

A stone is tied to one end of a string and rotated in horizontal circle with a uniform angular velocity. The tension in the string is T, if the length of the string is halved and its angular velocity is doubled , the tension in the string will be

Angular momentum of a rigid body rotating about a fixed Axis with angular velocity vec omega

A particle attached to a string is rotating with a constant angular velocity and its angular momentum is L. If the string is halved and angular velocity is kept constant, the angular momentum will be

A ball is whirled in a circle by attaching it to a fixed point with a string. Is there an angular rotation of the ball about its centre? If yes, is this angular velocity equal to the angular velocity of the ball about the fixed point?

In the figure, a ball of mass m is tied with two strings of equal as shown. If the rod is rotated with angular velocity omega_(1) when

A stone tied to a string of length l is whirled in a horizontal circle at a constant angular speed omega in a circle of radius r. If the string makes an angle theta with vertical then the tension in the string is :

Figure shows a mass m placed on a frictionless horizontal table and attached toa string passing through a mall hole in the surface. Initially, themas movesin a circle of radius r_0 with a speed v_0 and the ree end of the string is held by a person. The person pulls on the string slowly to decrease the radius of th circle of r. a. Find the tension in the string when the mass moves in the circle of radius r. b. Calculate the chasnge in the kinetic energy of the mass

A uniform disc of mass M, radius R is attached to a frictionless horizontal axis. Its rim is wound with a light string and a tension T is applied to it, the angular acceleration will be?

A bob in tied to a string of length l & and kept on a horizontal rough surface as shown in the figure when point O of the string is fixed. The bob is given a tangential velocity V_(0) keeping the string taut as shown in figure. Find the tension in the string as a function of time. The coefficient of kinetic friction is mu .

A ring of radius 'r' and mass per unit length 'm' rotates with an angular velocity 'omega' in free space then tension will be :

RESONANCE ENGLISH-CIRCULAR MOTION-Exercise
  1. A stone of mass m tied to a string of length l is rotated in a circle ...

    Text Solution

    |

  2. A simple pendulum is oscillating without damping. When the displacemen...

    Text Solution

    |

  3. A stone tied to a string of length L is whirled in a vertical circle w...

    Text Solution

    |

  4. A particle is acted upon by a force of constant magnitude which is alw...

    Text Solution

    |

  5. A bird is flying in the air. To take a turn in the horizontal plane of...

    Text Solution

    |

  6. A particle moves along a circle of radius (20/pi) m with constant tan...

    Text Solution

    |

  7. For a body in circular motion with a constant angular velocity, the ma...

    Text Solution

    |

  8. A ball suspended by a thread swings in a vertical plane so that its ac...

    Text Solution

    |

  9. The position vector of a particle in a circular motion about the origi...

    Text Solution

    |

  10. A car of maas M is moving on a horizontal circular path of radius r. A...

    Text Solution

    |

  11. A car moves at a constant speed on a road as shown in figure. The norm...

    Text Solution

    |

  12. Which of the following quantities may remain constant during the motio...

    Text Solution

    |

  13. A 1-kg stone at the end of 1m long string is whirled in a vertical cir...

    Text Solution

    |

  14. When the road is dry and coefficient of friciton is mu, the maximum sp...

    Text Solution

    |

  15. A coin placed on a rotating turntable just slips if it is placed at a ...

    Text Solution

    |

  16. A heavy & big sphere is hang with a string of length l. This sphere mo...

    Text Solution

    |

  17. A body is tied up by a string of length l and is rotated in verticle c...

    Text Solution

    |

  18. The maximum velocity at the lowest point, so that the string just slac...

    Text Solution

    |

  19. The breaking tension of a string is 10 N. A particle of mass 0.1 kg ti...

    Text Solution

    |

  20. A mass is supported on a frictionless horizontal surface. It is attach...

    Text Solution

    |