Home
Class 11
PHYSICS
An object of mass m is tied to a string ...

An object of mass m is tied to a string of length L and a variable force F is applied on it which brings the string gradually at angle `theta` with the vertical. Find the work done by the force F.

A

`mgL(1-sin theta)`

B

mgL

C

`mgL(1-cos theta)`

D

`mgL(1+cos theta)`

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) W=change in potential energy =mgh`=mgL(1-cos theta)`
Promotional Banner

Topper's Solved these Questions

  • WORK, ENERGY AND POWER

    DC PANDEY ENGLISH|Exercise MEDICAL ENTRANCE SPECIAL QUESTIONS|16 Videos

  • WORK, ENERGY AND POWER

    DC PANDEY ENGLISH|Exercise MATCH THE COLUMNS|7 Videos

  • WORK, ENERGY AND POWER

    DC PANDEY ENGLISH|Exercise CHECK POINT 6.3|10 Videos

  • WORK, ENERGY & POWER

    DC PANDEY ENGLISH|Exercise Level 2 Comprehension Based|2 Videos

  • WORK, POWER AND ENERGY

    DC PANDEY ENGLISH|Exercise E Integer Type Questions|11 Videos

Similar Questions

Explore conceptually related problems

An object of mass m is tied to a string of length l and a variable force F is applied on it which brings the string gradually at angle thit theta with the vertical. Find the work done by the force F .

A particle of mass m is tied to a string of length L and whirled into a horizontal plan. If tension in the string is T then the speed of the particle will be :

A block of mass M is being pulled with the help of a string of mass m and length L. the horizontal force applied by the man on the string is F. Determine (a) Find the force exerted by the string on the block and acceleration of system. (b) Find the tension at the mid point of the string. (c ) Find the tension at a distance x from the end at which force is applied. Assume that the block is kept on a frictionless horizontal surface and the mass is uniformly distributed in the string.

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 :

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.

A simple pendulum is constructed by attaching a bob of mas 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.

A string of length L and mass M is lying on a horizontal table. A force F is applied at one of its ends. Tension in the string at a distance x from the end at which force is applied is

A heavy particle of mass 1kg suspended from a massless string attached to a roof. A horizontal force F is applied to the particle such that in the equilibrium position the string makes and angle 30^(@) with the vertical. The magnitude of the force F equals .

A vertical spring of force cosntant 100 N//m is attached with a hanging mass of 10 kg. Now an external force is applied on the mass so that the spring is stretched by additional 2m. The work done by the force F is (g = 10 m//s^(2))

An object of mass 10kg is connected to the lower end of a massless string of length 4m hanging from the ceiling. If a force F is applied horizontally at the mid-point of the string, the top half of the string makes an angle of 45^(@) with the vertical , then the magnitude of F is

DC PANDEY ENGLISH-WORK, ENERGY AND POWER-EXERCISES(TAKING IT TOGETHER)
  1. A block is attached to a spring as shown and very-very gradually lower...

    Text Solution

    |

  2. A uniform chain of length L and mass M is lying on a smooth table and ...

    Text Solution

    |

  3. An object of mass m is tied to a string of length L and a variable for...

    Text Solution

    |

  4. A particle is moving in a conservative force field from point A to poi...

    Text Solution

    |

  5. Three particles A, B and C are thrown from the top of a tower with the...

    Text Solution

    |

  6. The force required to stretch a spring varies with the distance a show...

    Text Solution

    |

  7. Kinetic energy of a particle moving in a straight line varies with tim...

    Text Solution

    |

  8. A particle is released from height H. At certain height from the groun...

    Text Solution

    |

  9. Power applied to a particle varices with time as P =(3t^(2)-2t + 1) wa...

    Text Solution

    |

  10. A motor drives a body along a straight line with a constant force. The...

    Text Solution

    |

  11. Power supplied to a mass 2 kg varies with time as P = (3t^(2))/(2) wat...

    Text Solution

    |

  12. A force F acting on a body depends on its displacement S as FpropS^(-1...

    Text Solution

    |

  13. A ball is thrown vertically upwards with a velocity of 10 ms^(-1). It ...

    Text Solution

    |

  14. An open knife of mass m is dropped from a height h on a wooden floor. ...

    Text Solution

    |

  15. The force acting on a body moving along x-axis variation of the partic...

    Text Solution

    |

  16. How much mass is converted into energy per day in a nuclear power plan...

    Text Solution

    |

  17. A block of mass M is pulled along a horizontal surface by applying a f...

    Text Solution

    |

  18. If v be the instantaneous velocity of the body dropped from the top of...

    Text Solution

    |

  19. A block of mass 1 kg slides down a rough inclined plane of inclination...

    Text Solution

    |

  20. A proton is kept at rest. A positively charged particle is released fr...

    Text Solution

    |