1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

What is the vertical height.

  1. Sep 3, 2007 #1
    1. The problem statement, all variables and given/known dataA rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 11 m/s at an angle of 65 degrees above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so it's vertical speed is zero. What is the vertical height between the 2 climbers.

    Initial Velocity=11 m/s
    Angle above horizontal=65 degrees
    Vertical speed=0

    2. Relevant equations
    equations of kinematics


    3. The attempt at a solution
     
  2. jcsd
  3. Sep 3, 2007 #2

    Astronuc

    User Avatar

    Staff: Mentor

    Please show some work and effort on one's part.

    Initial Velocity=11 m/s

    Determine the horizontal and vertical velocity components.

    The horizontal velocity is constant if one ignores air resistance. The kit decelerates as it travels vertically.

    Refer to -
    http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html#tra5
     
  4. Sep 3, 2007 #3
    Here is what I did. I used the equation y=h=Vy^2 - Voy^2/ 2 (Ay)

    Then I used the values I had h=(0m/s)^2 - (11 m/s)^2/ 2 (-9.8m/s^2) = 6.1 meters

    The answer is 5.1 meters what did I do wrong
     
  5. Sep 3, 2007 #4

    Astronuc

    User Avatar

    Staff: Mentor

    vy0 is not 11 m/s.

    v0 = 11 m/s.

    Resolve v0 into vy0 and vx0

    Think about sin and cos of the angle with respect to horizontal.
     
  6. Sep 3, 2007 #5
    ok Vy0=11 sin 65=10 m/s
    and Vx0=11 cos 65=4.6 m/s

    Now what do I do
     
  7. Sep 3, 2007 #6
    Ok so it's h=0 m/s)^2 - 10 m/s) ^2/2 *-9.8 m/s^2=5.1
     
  8. Sep 3, 2007 #7
    Did I do it right
     
  9. Sep 3, 2007 #8

    Astronuc

    User Avatar

    Staff: Mentor

  10. Sep 3, 2007 #9
    Thank you Astronuc. It feels good learning how to solve a problem. Instead of just writing down the answer.
     
  11. Jan 30, 2008 #10
    Thanks!

    Thanks so much, I had the same problem. Ironically, I had split it up into components already, just for some reason I hadn't added it in to the formula as my VoY, I was still using the old Vo vector.

    Thanks!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: What is the vertical height.
Loading...