Need help with mechanics statics; finding resultant force

[byakkoshe]

Hi! Can anyone help me with these problems? When I try to draw a parallelogram, I couldn't find the angles. Please help.

http://imageshack.com/a/img673/8733/GsXt9f.jpg
http://imageshack.com/a/img910/1949/1AB7iB.jpg

 

[Raghav Gupta]

For 2-3
Take horizontal or vertical components. There are two variables.
Along horizontal
Fcosø- 700 cos15°=0
and along vertical
700 sin15° - F sinø= 500
2 variables , 2 equations. Hope you can solve.
Hope you know sin15° and cos15°. May have learned in Maths classes.
Why you removed the template? Violating rule of PF.
Guess you are new, so may not have read rules but take care in future

 

[azizlwl]

It is vector algebra. You can do ordinary addition to vectors of same direction. So try to resolve the vectors into x and y components and do ordinary math on them.