Results 1 to 2 of 2
Like Tree1Thanks
  • 1 Post By skeeter

Thread: Just started Vectors, could someone look over these four questions I did?

  1. #1
    Newbie
    Joined
    Nov 2017
    From
    U.S.A
    Posts
    14

    Just started Vectors, could someone look over these four questions I did?

    I apologize if this post isn't allowed, I'm doing an online Math class and the last Unit is Vectors. I have never done vectors before, and the online class Tutors/Helpers they provide are on holiday this month so I don't really have any help or guidance. I just wanna make sure that everything I'm doing is right so I don't mess up when I get further into the Unit.

    Heres a link to the questions and my answers for all of them,
    https://imgur.com/a/AZ9Qx

    The one I think I did wrong was question 49, in the lesson they gave to ways to draw the resultant, one of them ways to completely re-draw the shape but the other was to draw a line from b to a. I don't understand how that is the same thing so I'm not sure if any of 49 is right.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    16,216
    Thanks
    3702

    Re: Just started Vectors, could someone look over these four questions I did?



    -------------------------------------------------------------------------------------

    47. Is there something missing? you get a velocity vector from a position vector?

    the vector shown is 75 m, 70 degrees N of W, or N 20deg W

    48. not the diagram for 47 ... N 70deg W is a 70 deg angle between N and the vector

    49. your solution for #49 is ok

    50. $R_x = -60\cos(18)-45\cos(50)$

    $R_y = 60\sin(18)-45\sin(50)$

    $|R| = \sqrt{R_x^2+R_y^2} \approx 87.5 \, m$

    $\theta = 180 + \arctan\left(\dfrac{R_y}{R_x}\right) \approx 190.5^\circ$
    Last edited by skeeter; Dec 12th 2017 at 01:31 PM.
    Thanks from HallsofIvy
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: Jul 31st 2012, 01:30 AM
  2. Replies: 3
    Last Post: Nov 15th 2011, 05:10 PM
  3. Replies: 2
    Last Post: Oct 5th 2009, 10:53 AM
  4. Replies: 2
    Last Post: Sep 29th 2008, 11:38 AM
  5. Replies: 1
    Last Post: Jan 15th 2008, 03:34 PM

/mathhelpforum @mathhelpforum