Find the angle to the horizonal using the given information.

  • #1

Homework Statement


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.


Homework Equations



W = Fa Δd cosΘ
W = ½mv²
(think)


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.

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Dick
Science Advisor
Homework Helper
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Don't use work, and don't use velocity. Use mass and acceleration. Use F=ma. Split F into horizontal and vertical components.
 
  • #3
Don't use work, and don't use velocity. Use mass and acceleration. Use F=ma. Split F into horizontal and vertical components.
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 !
=)
 

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