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Two Physics problems

  1. Oct 4, 2009 #1

    The problem statement, all variables and given/known data

    Determine the x and y components of the following three vectors in the xy plane.
    (a) A 9-m displacement vector that makes an angle of 35° clockwise from the +y direction.
    x: ____ m
    y: ____ m

    (b) A 25-m/s velocity vector that makes an angle of 45° counterclockwise from the -x direction.
    x: ____ m/s
    y: ____ m/s

    (c) A 49-lb. force vector that makes an angle of 140° counterclockwise from the -y direction.
    x: ____ lb
    y: ____ lb


    You are watching your friend play hockey. In the course of the game, he strikes the puck in such a way that, when it is at its highest point, it just clears the surrounding 2.84 m high Plexiglas wall that is 10.8 m away. (Ignore any effects due to air resistance.)
    (a) Find the vertical component of its initial velocity.
    v0y = ____ m/s

    (b) Find the time it takes to reach the wall.
    Δt = ____ s

    (c) Find the horizontal component of its initial velocity, and its initial speed and angle.
    v0x = ____ m/s
    v0 = ____ m/s
    θ = ____ °

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 4, 2009 #2


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    Gold Member

    The rules of this forum clearly state
    Please follow them.
  4. Oct 4, 2009 #3
    Ok, I need help with the first one. I'm trying to set it up but I don't get what it's asking for. Can you help explain?

    Ok, I figured it out, I set it up on paper and got it.
  5. Oct 4, 2009 #4
    I got the first one. I saw to get x you do sin(35) and then multiply by 9. And the same with y but cos instead of sin. I did the same thing for (b) in the first problem and it wasn't right. It's a velocity vector instead of a displacement vector. What difference does thi make for finding the solution?
  6. Oct 4, 2009 #5


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    Make a drawing. Are there any negative components?
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