Home
Class 11
PHYSICS
A particle moves from position vector v...

A particle moves from position vector ` vecr_1 = ( 23 hat I + 2 hat j - 6 hat k)` to position vector, ` vec r-2 = ( 14 hat I + 13 hat j+ 9 hat k)` in metre under the action of a constant force of ` vec F = 9 14 hat i+ hat j + 3 hat k) N`. Calculat word done by the force.

Text Solution

Verified by Experts

Here, ` vec r_1 = ( 3 hat i+ 2 aht - 6 hat k)` ltBrgt ` vecr_2 = ( 14 hat i+ 13 hat j + 9 hat k)`
` vec F ( 4 hat i+ hat j+ 3 aht k) N , W=?`
Edsplacement ` vec r_(12) = vec 2 - vec _1`
` = ( 14 hat i+ 13 hat j + 9 hat k) - ( 3 hat i+ 2 aht j -6 aht k)` ltbRgt ` = 11 hat i+ 11 aht j + 15 aht k`
` W= vec F. vecr_(12) = (4 hat i +hat j = 3 aht k) . 11 hat j + 11 hat i+ 11 hat j= 15 aht k)` ltbRgt ` =344 hat i hat i+ 11 hat j hat j= 45 hathat k. hat k = 100 j`.
Promotional Banner

Topper's Solved these Questions

  • KINEMATICS

    PRADEEP|Exercise 4 Problems for practice|45 Videos
  • KINEMATICS

    PRADEEP|Exercise 1 Multiple choice|10 Videos
  • KINEMATICS

    PRADEEP|Exercise 2 Problems for practice|36 Videos
  • GRAVIATION

    PRADEEP|Exercise Assertion-Reason Type Questions|19 Videos
  • LAWS OF MOTION

    PRADEEP|Exercise Assertion- Reason Type Questions|17 Videos

Similar Questions

Explore conceptually related problems

A particle moved from position vec r_(1) = 3 hat i + 2 hat j - 6 hat k to position vec r_(2) = 14 hat i + 13 hat j + 9 hat k under the action of a force ( 4 hat i + hat j + 3 hat k) newton. Find the work done

A particle is displaced from position vec(r )_(1) = (3hat(i) + 2hat(j) + 6hat(k)) to another position vec(r )_(2)= (14hat(i) + 13hat(j) + 9hat(k)) under the impact of a force 5 hat(i)N . The work done will be given by

A particle moves form position vec(s_(1))=(3hat(i)+2hat(j)-6hat(k)) m to position of vec(s_(2))=(14hat(i)+13hat(j)-9hat(k)) m, under the action of a force vec(F)=(14hat(i)+13hat(j)-9hat(k)) N, The work done by the force is

Show that vectors vec A =2 hat I -3 hat j - hat k and vec vec B =- 6 hat I + 9 hat j + 3 hat k are paarallel.

Find the scalr and vector products of two vectors vec a =(3 hat I - 4 hat j + 5 hat k) and vec b = (-2 hat I + hat j- 3 hat k).

A body is displaced from vec r_(A) =(2hat i + 4hatj -6hat k) to vecr_(B) = (6hat i -4hat j +3 hat k) under a constant force vec F = (2 hat i + 3 hat j - hat k) . Find the work done.

The vector component of vector vec(A) = 3 hat(i) + 4 hat(j) + 5 hat(k) along vector vec(B) = hat(i) + hat(j) + hat(k) is

Find a unit vector parallel to the resultant of vectors vec A = 3 hat I + 3 hat j - 2 hat k and vec B= hat i- 5 hat j + hat k .

The unit vector perpendicular to vec A = 2 hat i + 3 hat j + hat k and vec B = hat i - hat j + hat k is

If vec(a) = hat(i) + 2 hat(j) + 3 hat(k) and vec(b) = 2 hat(i) + 3 hat(j) + hat(k) , find a unit vector in the direction of ( 2 vec(a) + vec(b)) .

PRADEEP-KINEMATICS-3 Problems for practice
  1. Show that vec A = hat I - 5 hat j and vec B= 2 hat I - 10 hat j are...

    Text Solution

    |

  2. Find the component of a vectro vec A = 3 hat I + 2 hat j along the di...

    Text Solution

    |

  3. If vec a and vec b are two non collinerar unit vectors and if | vec ...

    Text Solution

    |

  4. A particle moves from position vector vecr1 = ( 23 hat I + 2 hat j - ...

    Text Solution

    |

  5. A force of 6 hat i+ 7 hat j newton makes a body move on a rough loane...

    Text Solution

    |

  6. Determine the sine of the angle between the vectors ( 3 hat i+ 3hat j+...

    Text Solution

    |

  7. Calculate the area of a paralleogeram whose adjcent sides are given by...

    Text Solution

    |

  8. Find the area of the rriangle formed by the tips of the vectors, ve...

    Text Solution

    |

  9. A verctor of magnitude 100 N is inclined at an angle of 30^@ to anot...

    Text Solution

    |

  10. If | vec A| = 2, | vec B| =5 and | vec A xx vec B | =8 , din the va...

    Text Solution

    |

  11. Dine the unit vector peroendicular to each of the vectors 3 hat i+ ha...

    Text Solution

    |

  12. Fven that vec A xx vec B= vec B xx vec C = vec 0. If vec A. vec B a...

    Text Solution

    |

  13. For any to vectors vec A and vec B, prove that |vec A xx vec B|^2 =...

    Text Solution

    |

  14. Find the area of a traiangle formed by the tips of the vectors vec c ...

    Text Solution

    |

  15. Three vector vec A, vec B and vec C are such that vec A= vec B+ vec ...

    Text Solution

    |

  16. Find the vector sum of N coplanar forces, each of the magnitude F,when...

    Text Solution

    |

  17. A vector vec A when added to the vector vec B = 3. 0 hat i+ 4 hat j y...

    Text Solution

    |

  18. A vector vec A of magniude (A) is turned through an angle theta. Calc...

    Text Solution

    |

  19. Two vector vec P and vec Q act at a point and have a resultant R1. ...

    Text Solution

    |

  20. Two cacar starts together from the asme point and move along two strai...

    Text Solution

    |