Home
Class 12
PHYSICS
A man of mass 60 kg, carrying a load of ...

A man of mass 60 kg, carrying a load of mass 40 kg on his head, climbs up a 15 m long staircase to the top of a building 5 m high. What is the work done by the man?

A

49 KJ

B

4 KJ

C

4.9 KJ

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
c
Work done, `W=(M+m)gh=(60+40)xx9.8xx5`
=`4.9xx10^(3)`
Promotional Banner

Topper's Solved these Questions

  • WORK , POWER , ENERGY AND COLLISIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (LEVEL-II)|67 Videos

  • WORK , POWER , ENERGY AND COLLISIONS

    MODERN PUBLICATION|Exercise Multiple Choice Questions (LEVEL-III)|5 Videos

  • WAVE OPTICS

    MODERN PUBLICATION|Exercise Recent Competitive Questions|18 Videos

Similar Questions

Explore conceptually related problems

A man weighing 49 kg carries a bag of 2 kg . He climbs to the top of a building 100 m tall in 5 minute . Calculate the work done by the man and the power he develops .

A man of 55 kg is holding a bucket of mass 25 kg. He walks 50 m on a level road at a constant speed of 3 ms" and then climbs up a hill of height 20 m. What is the work done by the man ?

A cart is used to lower vertically, a block of mass 10 kg over a distance of 0.30 m, at a constant downward acceleration of ((g)/(4)) . Find the work done by the cart on the block.

Answer the following : In Fig.6.13. (i) the man walks 2m carrying a mass of 15kg on his hands. In Fig. 6.13. (ii), he walks the same distance pulling the rope behind him. The rope goes over a pulley, and a mass of 15 kg hangs at its other end. In which case is the work done greater?

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table ?

MODERN PUBLICATION-WORK , POWER , ENERGY AND COLLISIONS-Revision Test
  1. A man of mass 60 kg, carrying a load of mass 40 kg on his head, climbs...

    Text Solution

    |

  2. A ball is dropped from height of Im. If coefficient of restituion betw...

    Text Solution

    |

  3. A metal ball hits a wall and does not rebound, where as  b a rubber ba...

    Text Solution

    |

  4. The velocity of a body of mass 2.5 kg is changed from vecVi =(3hati-4h...

    Text Solution

    |

  5. The value of 1 Mev is equal to :

    Text Solution

    |

  6. A particle is projected vertically upwards with a velocity given by V=...

    Text Solution

    |

  7. A spring of constant 5xx10^(3) N/m is stretched initially by 5 cm from...

    Text Solution

    |

  8. Consider the following two statements. a. Linear momentum of a sys...

    Text Solution

    |

  9. A body of volume V and dinsity p is raised through height h in a liqiu...

    Text Solution

    |

  10. A child is swinging a swing. He is one metre above the ground at the l...

    Text Solution

    |

  11. A canon shell explodes in mid air, its total

    Text Solution

    |

  12. A body at rest may have :

    Text Solution

    |

  13. A car is moving along a straight horizontal road with a speed V. If th...

    Text Solution

    |

  14. If a body of mass m moving with velocity v collides with another body ...

    Text Solution

    |

  15. A ball is projected vertically upward with an initial velocity. Which ...

    Text Solution

    |

  16. A motor with an efficiency of 90% drives a pump, whose efficiency is 6...

    Text Solution

    |

  17. A lorry and a car moving with the same kinetic energy are bought to re...

    Text Solution

    |

  18. The power of motor pump is 2 KW. The water raised by the pump per minu...

    Text Solution

    |

  19. The energy required to accelerate a car from rest to 10 ms^(-1) is W. ...

    Text Solution

    |

  20. A man weighing 60 kg lifts a body of 15 kg to a top of building 10 m h...

    Text Solution

    |

  21. A sphere of mass M moving with velocity w collides elastically with an...

    Text Solution

    |