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!

Find the angle to the horizonal using the given information.

  1. Dec 3, 2008 #1
    1. The problem statement, all variables and given/known data
    A man pulls a wooden crate across a floor by a rope.
    Mass of the crate = 15Kg
    Force the man pulls with = 65N
    Acceleration of the box = 20 M/s²

    What is the angle to the horizontal at which the man pulls the rope.


    2. Relevant equations

    W = Fa Δd cosΘ
    W = ½mv²
    (think)


    3. The attempt at a solution

    I clearly don't understand this, but at first I figured I would use W = Fa Δd cosΘ and just rearrange the equation, then I realized, I don't have Work, figured I would find that using
    W = ½mv². Then I realized I don't have Velocity, I can't find velocity without distance and I can't find distance without time.
    I'm lost.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Dec 3, 2008 #2

    Dick

    User Avatar
    Science Advisor
    Homework Helper

    Don't use work, and don't use velocity. Use mass and acceleration. Use F=ma. Split F into horizontal and vertical components.
     
  4. Dec 3, 2008 #3
    Bah! I feel so silly, this whole unit is on energy and work I became a little closed minded and forgot there were other formulas I could use.
    Thank you !
    =)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Find the angle to the horizonal using the given information.
Loading...