Home
Class 12
PHYSICS
A force vecF=(5hati+3hatj+2hatk)N is app...

A force `vecF=(5hati+3hatj+2hatk)N` is applied over a particle which displaces it from its origin to the point `vecr=(2hati-hatj)` m. The work done on the particle in joules is :

A

-7

B

`+7`

C

`+10`

D

`+13`

Text Solution

Verified by Experts

The correct Answer is:
b
Here, `W=vecF.vecS`
=`(5hati+3hatj+2hatk).(2hati-hatj)`
=10-3=7 J.
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 force of vecF=(hati+2hatj+3hatk)N when acting on a particle propels it from a point (hati+hatj+hatk) to a point (hati-hatj+2hatk) . Calculate the amount of work done by the force.

Forces of magnitude 3 and 2 units acting in the directions 5 hati + 3 hatj + 4 hatk and 3 hati + 4 hatj - 5hatk respectively act on a particle which is displaced from the point (1 , 1 , -1) to (3 , 3 , 1) . The work done by the forces is equal to

If a force vecF=(-3hati+4hatj+2hatk) acts on a body and displaces it such that vecs=(4hati-3hatj-2hatk) then calculate the amount of work done by the force.

A particle acted by constant forces 4 hati + hatj - 3 hatk and 3 hati + hatj - ahtk is displaced from the point hati + 2 hatj + 3 hatk to the point 5 hati + 4 hatj + hatk. The total work done by the forces is :

Find the distance of a point (2,5,-7) from the plane vecr.(6hati-3hatj+2hatk)=4

MODERN PUBLICATION-WORK , POWER , ENERGY AND COLLISIONS-Revision Test
  1. A force vecF=(5hati+3hatj+2hatk)N is applied over a particle which dis...

    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

    |