- #1
KEØM
- 68
- 0
Homework Statement
Shown are a mast and a portion of the rigging of a schooner. Members CD and EF lie in the same plane, and CD is of length 7.5 m and forms an angle of 45° with a vertical line drawn through C. Knowing that when [tex]\theta[/tex] = 45° the tension in rope BD is 250N, determine, (a) the angle between the rope BD and gaff CD, (b) the projection on CD of the force exerted by rope BD at point D.
Here is a link to a file sharing site with a picture of the problem. It is number 3.42 on the scanned page.
"[PLAIN problem3.42.pdf"]http://jumalafiles.info/showfile2-37705393236825434789501909625354498/problem342.pdf">download problem3.42.pdf[/URL]
Homework Equations
[tex]\vec{P}\bullet\vec{Q} = PQcos\theta[/tex]
[tex]\vec{\lambda_{DC}}\bullet\vec{\lambda_{DB}} = cos\theta[/tex]
where [tex]\vec{\lambda}[/tex] is a unit position vector defining the rope portion DB and member DC in the problem.
The Attempt at a Solution
I found [tex]\vec{\lambda_{DC}}[/tex] using the given angles but I cannot find [tex]\vec{\lambda_{DB}}[/tex] with the given info. Any thoughts?
Thanks in advance,
KEØM
Last edited by a moderator: