Vectors

posted by .

Vectors a and b have magnitudes 2 and 3, respectively. If one of them is 50degrees, find the vector 5a-2b and state its magnitude.

  • Vectors -

    Use the law of cosines: You know two sides, and the included angle.

    Draw the figure before you compute.

  • Vectors -

    I tried that but it doesn't work.

    I did (5)(2^2)+(2)(3^2)-(2)(2)(3)cos50.

  • Vectors -

    vector 5a has magnitude 10 and call it at 50 degrees
    vector 2 b has magnitude 6 and call it at 0 degrees
    so our triangle is
    10 and 6 with fifty degrees between them
    so the magnitude we are looking for is from
    c^2 = 10^2 + 6^2 - 10*6*cos 50
    that is why it did not work.

  • Vectors -

    At what angle should be adjusted the two vectors to have the same value of their llA+Bll and llA-Bll?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Discrete Math - Geometric Vectors

    Under what conditions will 3 vectors having magnitudes of 7, 24 and 25, respectively, have the zero vector as a resultant?
  2. Discrete Math - Vectors

    Can you please help me correct my answers for the following two questions?
  3. Vectors

    Two vectors, A and B, are added by means of vector addition to give a resultant vector R. The magnitudes of A and B are 9 m and 8 m, respectively, and they can have any orientation. What are the maximum and minimum possible values …
  4. URGENT - Vectors

    Two vectors, A and B, are added by means of vector addition to give a resultant vector R. The magnitudes of A and B are 9 m and 8 m, respectively, and they can have any orientation. What are the maximum and minimum possible values …
  5. physics

    Can you help me with this one also? I know how to do it with 3 vectors but I can't seem to draw it with 4 vectors. The magnitudes of the four displacement vectors shown in the drawing are A=16.0 m, B=11.0 m, C=12.0 m, and D=26.0 m.
  6. Physics

    2. We have two vectors that line in the x-y plane. If we take the cross-product of those two vectors we know that a. the magnitude of the cross-product will always be equal to the product of the magnitudes of the two vectors. b. the …
  7. physics

    A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction …
  8. physics

    Vector has a magnitude of 136 units and points 35.0 ° north of west. Vector points 69.0 ° east of north. Vector points 19.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find …
  9. physics

    Consider two vectors ~ A and ~ B and their re- sultant ~ A + ~ B . The magnitudes of the vectors ~ A and ~ B are, respectively, 13 . 2 and 6 . 1 and they act at 110 ◦ to each other.Find the magnitude of the resultant vector ~ …
  10. Physics

    A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. The magnitudes of these vectors are A = 5.0 m, B= 15 m, and C = 18 m. Using the component method, find the magnitude and direction …

More Similar Questions