Home
Class 11
PHYSICS
A bucket tied to a string is lowered at ...

A bucket tied to a string is lowered at a constant acceleration of `g//4`. If mass of the bucket is m and it is lowered by a distance `l` then find the work done by the string on the bucket.

A

(1/4) mgd

B

(-3/4) mgd

C

(-4/3) mgd

D

(4/3) mgd

Text Solution

Verified by Experts

The correct Answer is:
B
Let tension in string be T, then work done by tension T=td
Applying newton's second law on the bucket

`mg-T=m(g/4) ` or `T=3/4 mg`
`:.` required work done `=-3/4 mg d`
Promotional Banner

Topper's Solved these Questions

  • WAVE OPTICS

    RESONANCE ENGLISH|Exercise Exercise|35 Videos

Similar Questions

Explore conceptually related problems

A block of mass m tied to a string is lowered by a distance d, at a constant acceleration of g//3 . The work done by the string is

A block of mass m tied to a string is lowered by a distance d, at a constant acceleration of g//3 . The work done by the string is

A block of mass m tied to a string is lowered by a distance d, at a constant acceleration of g//3 . The work done by the string is

A man pulls out a block of mass m from the depth d with help of a light string. If acceleration of the block is g/2 then the work done by the string on the block will be

A block of mass 5kg is being raised vertically upwards by the help of a string attached to it. It rises with an acceleration of 2ms^-2 . Find the work done by the tension in the string if the block rises by 2.5m . Also find the work done by the gravity and the net work done.

If the string & all the pulleys are ideal, acceleration of mass m is :-

A mass M is lowered with the help of a string by a distance h at a distance acceleration g//2 . The work done by the string will be

A bucket full of water weighs 5 kg, it is pulled from a well 20 m deep. There is a small hole in the bucket through which water leaks at a constant rate. If it is observed that for every meter the bucket loses 0.2 kg mass of water, then the total work done in pulling the bucket up from the well is [g = 10ms^(-2) ]

A block of mass 2 kg is being brought down by a string. If the block acquires a speed 1(m)//(s) in dropping down 25 cm, find the work done by the string in the process.

A string is used to pull a block of mass m vertically up by a distance h at a constant acceleration (g)/(3) . The work done by the tension in the string is

RESONANCE ENGLISH-WORK POWER AND ENERGY-Exercise
  1. An object is moving along a straight line path from P to Q under the ...

    Text Solution

    |

  2. A bucket tied to a string is lowered at a constant acceleration of g//...

    Text Solution

    |

  3. The block of mass m initially at x=0 is acted upon by a horizontal for...

    Text Solution

    |

  4. The work done by the force = vec F = A (y^(2) hati + 2 x^(2) hatj), wh...

    Text Solution

    |

  5. A chain is held on a frictionless talbe with L//4 hanging over. Knowin...

    Text Solution

    |

  6. A particle of mass m moving along a straight line experiences force F ...

    Text Solution

    |

  7. Which of the following statements is not true?

    Text Solution

    |

  8. In figure, the ball A is released from rest, when the spring is at its...

    Text Solution

    |

  9. In the figure shown initial spring is in unstretched state and blocks ...

    Text Solution

    |

  10. A block attached to a spring, pulled by a constant horizontal force, i...

    Text Solution

    |

  11. A body is projected with kinetic energy k at angle phi with the vertic...

    Text Solution

    |

  12. A man places a chain (of mass m and length l) on a table slowly. Initi...

    Text Solution

    |

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

    Text Solution

    |

  14. A constant power P is applied to a particle of mass m. The distance tr...

    Text Solution

    |

  15. The force acting on a body is inversely proportional to the distance (...

    Text Solution

    |

  16. The graph between the resistance force F acting on a body and the dist...

    Text Solution

    |

  17. A particle moves in a straight line with retardation proportional to i...

    Text Solution

    |

  18. A body is falling under gravity . When it loses a gravitational potent...

    Text Solution

    |

  19. A block of mass m is attached to two unstretched springs of spring con...

    Text Solution

    |

  20. A body of mass m dropped from a certain height strikes a light vertica...

    Text Solution

    |