Home
Class 11
PHYSICS
If the resultant of the vectors 3 hati +...

If the resultant of the vectors `3 hati +4 hatj +5 hatk` and `5 hati +3 hatj + 4hatk` makes an angle `theta` with x-axis, then find `cos theta`.

Text Solution

Verified by Experts

The correct Answer is:
`0.5744`
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

The resultant of vectors vecA=3hati+4hatj+5hatk and vecB =5hati+3 hatj+4hatk makes an angle theta with the X-axis . Evaluate cos theta .

Find the sum of the vectors veca = -2hati+hatj-4hatk and vecb = 3hati-hatj+5hatk .

The angle between the two vectors A=3 hati+4hatj+5hatk and B=3hati+hatj-5hatk is

Find the angle between the vectors hati-2hatj+3hatk and 3hati-2hatj+hatk .

If theta is the angle between the vectors a=2hati+2hatj-hatk and b=6hati-3hatj+2hatk , then

The angle between the two vectors -2hati+3hatj-hatk and hati+2hatj+4hatk is

The unit vector parallel to the resultant of the vectors 2hati+3hatj-hatk and 4hati-3hatj+2hatk is

A unit vector perpendicular to both the vectors 2hati-2hatj+hatk and 3hati+4hatj-5hatk , is

Determine the sine of the angle between the vectors 3 hati +hatj +2hatk and 2hati - 2hatj +4hatk .

SL ARORA-VECTORS-Problems For Self Practice
  1. The sum and difference of two vectors vec(A) and vec(B) are vec(A) +ve...

    Text Solution

    |

  2. A force vec(F) = 5hati + 4hatj newton displaces a body through vec(S) ...

    Text Solution

    |

  3. If the resultant of the vectors 3 hati +4 hatj +5 hatk and 5 hati +3 h...

    Text Solution

    |

  4. Show that the vectors a =3hati - 2hatj+hatk, b=hati - 3hatj+5hatk and ...

    Text Solution

    |

  5. If vectors vec(A),vec(B) and vec(C) have magnitudes 8,15 and 17 units ...

    Text Solution

    |

  6. If vec A =vec B- vec C, then determine the angle between vec A and ve...

    Text Solution

    |

  7. For two vectors vec(A) and vec(B) if vec(A) + vec(B) = vec(C) and A +B...

    Text Solution

    |

  8. Prove that (vec(A) +2vec(B)) .(2vec(A) - 3vec(B)) = 2A^(2) +AB cos the...

    Text Solution

    |

  9. Prove that the vectors vec(A) = 4 hati +3hatj +hatk and vec(B) = 12 ha...

    Text Solution

    |

  10. If vec(A) = 2hati +3 hatj +hatk and vec(B) = 3hati + 2hatj + 4hatk, th...

    Text Solution

    |

  11. Find the value of a for which the vectors 3 hati + 3hatj + 9 hatk and ...

    Text Solution

    |

  12. Find a unit vector perpendicular the vectors vec(A) = 4 hati = hatj +3...

    Text Solution

    |

  13. Find the sine of the angle between the vectors vec(A) = 3 hati - 4hatj...

    Text Solution

    |

  14. Find a vector of magnitude 18 which is perpendicular to both the vecto...

    Text Solution

    |

  15. Determine the area of the parallelogram whose adjacent sides are forme...

    Text Solution

    |

  16. Find the area of the triangle formed by points O,A and B such that vec...

    Text Solution

    |

  17. Find with the help of vectors, the area of the triangle with vertices ...

    Text Solution

    |

  18. If vec(A) and vec(B) are two such vectors that |vec(A)| = 2, |vec(B)| ...

    Text Solution

    |

  19. Find the moment about the point hati + 2hatj - hatk of a force represe...

    Text Solution

    |

  20. Prove that (vec(a) + vec(b)) xx (vec(a) - vec(b)) = 2 (vec(b) xx vec(a...

    Text Solution

    |