Home
Class 12
PHYSICS
A bob of mass m attached to an inextensi...

A bob of mass m attached to an inextensible string of length l is suspended from a verticle support. The bob rotates in a horizontal circle with an angular speed `omega "rad"//s` about the verticle. About the point of suspension.

A

angular momentum changes in direction but not in magnitude

B

angular momentum changes both in direction and in magnitude

C

angular momentum changes both in direction and in magnitude

D

angular momentum changes in magnitude but not in direction

Text Solution

Verified by Experts

The correct Answer is:
A
`v=w(sin theta)`
`L_(P) =|vecr xx m vecv| = |(momega I sin theta)|`
Magnitude remains constant but direction changes according to right hand rule.
Promotional Banner

Topper's Solved these Questions

  • ROTATIONAL MOTION

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive) (SINGLE OPTION CORRECT TYPE)|26 Videos

  • ROTATIONAL MOTION

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive) (MULTIPLE OPTIONS CORRECT TYPE)|17 Videos

  • ROTATIONAL MOTION

    VMC MODULES ENGLISH|Exercise LEVEL - 2 (Angular Momentum, Collision)|20 Videos

  • REVISION TEST-2 JEE

    VMC MODULES ENGLISH|Exercise PHYSICS|25 Videos

  • SIMPLE HARMONIC MOTION

    VMC MODULES ENGLISH|Exercise 7-previous year question|46 Videos

Similar Questions

Explore conceptually related problems

A bob of mass m attached to an inextensible string of length I is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed omega red/s about the vertical. About the point of suspension:

A smalll bob attached to a string of length l is suspended from a rigid support and rotates with uniform speed along a circle in a horizontal plane. Let theta be the angle made by the string with the vertical, then the length of a simple pendulum having the same period is

Three balls each of mass 1 kg are attached with three strings each of length 1 m as shown in figure. They are rotated in a horizontal circle with angular velocity omega=4"rad s"^(-1) about point O. Match the following columns.

Three balls each of mass 1 kg are attached with three strings each of length 1 m as shown in figure. They are rotated in a horizontal circle with angular velocity omega=4"rad s"^(-1) about point O.find the tensions .

A particle of mass m is attached to a vertical rod with two inextensible strings AO and BO of equal lengths l. Distance between A and B is also l. The setup is rotated with angular speed omega with rod as the axis.

A metal bob of mass 0.6 kg is attached to the end of a string of length 1 m and the bob is whirled in a horizontal circle with a uniform speed of 12 m/s. What is the centripetal force acting on the bob ? If the speed of the bob is 5 m/s calculate the tension in the string.

A metal wire of length L is suspended vertically from a rigid support. When a bob of mass M is attached to the lower end of wire, the elongation of the wire is l:

A bob of mass m suspended by a light inextensible string of length 'l' from a fixed point. The bob is given a speed of sqrt(6gl) . Find the tension in the string when string deflects through an angle 120^@ from the vertical.

A bob hangs from a rigid support by an inextensible string of length l. It is released from rest when string makes an agngle 60^(@) with vertical . The speed of the bob at the lowest position is

A simple pendulum is constructed by attaching a bob of mass m to a string of length L fixed at its upper end. The bob oscillates in a vertical circle. It is found that the speed of the bob is v when the string makes an angle theta with the vertical. Find the tension in the string at this instant.

VMC MODULES ENGLISH-ROTATIONAL MOTION -JEE MAIN (ARCHIVE)
  1. A pulley os radius 2m is rotated about its axis by a force F= (20 t- ...

    Text Solution

    |

  2. A hoop of radius r and mass m rotating with an angular velocity omega(...

    Text Solution

    |

  3. A bob of mass m attached to an inextensible string of length l is susp...

    Text Solution

    |

  4. A mas m hangs with help of a string wraped around a pulley on a fricti...

    Text Solution

    |

  5. A mass ‘m’ is supported by a massless string wound around a uniform ho...

    Text Solution

    |

  6. From a solid sphere of mass M and radius R a cube of maximum possible ...

    Text Solution

    |

  7. Seven identical circular planar disks, each of mass M and radius R are...

    Text Solution

    |

  8. From a uniform circular disc of radius R and mass 9M, a small disc of ...

    Text Solution

    |

  9. A thin circular plate of mass M and radius R has its density varying a...

    Text Solution

    |

  10. A rectangle solid box of length 0.3m is held horizontally , with one o...

    Text Solution

    |

  11. A solid sphwere and solid cylinder of identical radii approach an incl...

    Text Solution

    |

  12. The following bodies are made to roll up (without slipping) the same i...

    Text Solution

    |

  13. A stationary horizontal disc is free to rotate about its axis. When a ...

    Text Solution

    |

  14. A thin smooth rod of length L and mass M is rotating freely with angul...

    Text Solution

    |

  15. Moment of inertia of a body about a given axis is 1.5 kg m^(2). Intial...

    Text Solution

    |

  16. A thin disc of mass M and radius R has mass per unit area sigma( r)=kr...

    Text Solution

    |

  17. The coordinates of a particle of mass 'm' as function of time are give...

    Text Solution

    |

  18. Two uniform circular rough disc of moment of inertia I(1) and (I(1))/(...

    Text Solution

    |

  19. The time dependence of the position of a particle of mass m = 2 is giv...

    Text Solution

    |

  20. A solid sphere of mass m & rdius R is divided in two parts of m mass (...

    Text Solution

    |