Home
Class 11
PHYSICS
If vec F = 2 hat i - 3 hat j N and vec r...

If `vec F = 2 hat i - 3 hat j N` and `vec r = 3 hat i + 2 hat j m` then torque `vec tau` is

A

`12 hatk`

B

`13 hatk`

C

`-12 hatk`

D

`-13 hatk`

Text Solution

Verified by Experts

The correct Answer is:
D
`vec(tau)=vec(r)xxvec(F)`
Promotional Banner

Topper's Solved these Questions

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-II(C.W.)|64 Videos

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise Level-III|66 Videos

  • SYSTEM OF PARTICLES

    NARAYNA|Exercise C.U.Q.|83 Videos

  • PHYSICAL WORLD

    NARAYNA|Exercise C.U.Q|10 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTION

    NARAYNA|Exercise EXERCISE - IV|39 Videos

Similar Questions

Explore conceptually related problems

If vec(F) = 2hat(i) - 3hat(j) N and vec(r ) = 3hat(i) + 2hat(j) m then torque vec(tau) is

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 + 3 hat j + 2 hat K and vec B = 3 hat i + hat j + 2 hat k , then find the vector product vec A xx vec B .

Let vec a=2 hat i- hat j+ hat k , vec b= hat i+2 hat j= hat ka n d vec c= hat i+ hat j-2 hat k be three vectors. A vector in the plane of vec ba n d vec c , whose projection on vec a is of magnitude sqrt(2//3) , is a. 2 hat i+3 hat j-3 hat k b. 2 hat i-3 hat j+3 hat k c. -2 hat i- hat j+5 hat k d. 2 hat i+ hat j+5 hat k

If vec(A) = 3 hat(i) - 4 hat(j) and vec(B) = 2 hat(i) + 16 hat(j) then the magnitude and direction of vec(A) + vec(B) will be

If vec A=hat I + 2 hat j -3 hat k , vec B =2 hat I -hat j + hat k and vec Chat I -3 hat j + 2 hat k , then find vec A xx ( vec B xx vec C).

Let vec a= hat i+ hat j+ hat k , vec b= hat i- hat j+ hat ka n d vec c= hat i- hat j- hat k be three vectors. A vector vec v in the plane of vec aa n d vec b , whose projection on vec c is 1/(sqrt(3)) is given by a. hat i-3 hat j+3 hat k b. -3 hat i-3 hat j+3 hat k c. 3 hat i- hat j+3 hat k d. hat i+3 hat j-3 hat k

Let vec a= hat j- hat k and vec c= hat i- hat j- hat k . Then vector vec b satisfying vec axx vec b+ vec c= vec0 and vec adot vec b=3 is (1) 2 vec i- vec j+2 vec k (2) hat i- hat j-2 hat k (3) hat i+j-2 hat k (4) - hat i+ hat j-2 hat k

For what value of lambda are the vector vec a and vec b perpendicular to each other? where: vec a=lambda hat i+2 hat j+ hat k and vec b=4 hat i-9 hat j+2 hat k vec a=lambda hat i+2 hat j+ hat k and vec b=5 hat i-9 hat j+2 hat k vec a=2 hat i+3 hat j+4 hat k and vec b=3 hat i+2 hat j-lambda hat k vec a=lambda hat i+3 hat j+2 hat k and vec b= hat i- hat j+3 hat k

If vec a=2 hat i-3 hat j+ hat k ,\ vec b=- hat i+ hat k ,\ vec c=2 hat j- hat k are three vectors find the area of the parallelogram having diagonals ( vec a+ vec b)\ a n d\ ( vec b+ vec c)dot

NARAYNA-SYSTEM OF PARTICLES-Level-1(C.W.)
  1. A stationary wheel starts rotating about its own axis at uniform rate ...

    Text Solution

    |

  2. A stationary wheel starts rotating about its own axis at constant angu...

    Text Solution

    |

  3. If vec F = 2 hat i - 3 hat j N and vec r = 3 hat i + 2 hat j m then to...

    Text Solution

    |

  4. A crowbar of length 120 cm has its fulcrum situated at a distance of 2...

    Text Solution

    |

  5. Three particles of masses 1gm, 2gm & 3gm are at 1cm, 2cm & 3cm from th...

    Text Solution

    |

  6. A hoop of mass 500gm & radius 10cm is placed on a nail, then the momen...

    Text Solution

    |

  7. The ratio of moments of inertia of two solid spheres of same mass but ...

    Text Solution

    |

  8. The radius of a solid sphere is R and its density D. When it is made t...

    Text Solution

    |

  9. Four point size bodies each of mass M are fixed at four corners of a l...

    Text Solution

    |

  10. Four particles each of mass m are placed at the corners of a square of...

    Text Solution

    |

  11. Four particles each of mass m are placed at the corners of a square of...

    Text Solution

    |

  12. Four particles each of mass m are placed at the corners of a square of...

    Text Solution

    |

  13. Four particles each of mass m are placed at the corners of a square of...

    Text Solution

    |

  14. The diameter of a fly wheel is R. Its coefficient of linear expansion ...

    Text Solution

    |

  15. Three point sized bodies each of mass M are fixed at three corners of ...

    Text Solution

    |

  16. Three point sized bodies each of mass M are fixed at three corners of ...

    Text Solution

    |

  17. Three point sized bodies each of mass M are fixed at three corners of ...

    Text Solution

    |

  18. The radius of gyration of body is 18cm when it is rotating about an ax...

    Text Solution

    |

  19. The position of axis of rotation of a body is changed so that its mome...

    Text Solution

    |

  20. A diatomic molecule is formed by two atoms which may be treated as mas...

    Text Solution

    |