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Determine resultant: 25N at 10degrees to the horizontal and 30N horizontally.

Mathematics
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relatively simple. again, i ask for the angle only.
|dw:1333533030424:dw|
|dw:1333522316234:dw|

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Other answers:

try using cosine law
but there are no angles hen (10 isnt' actual an angle within the triangle)
it's 170
wut. how?
because 25 is applied 10 degree to horizontal ... and obviously, it makes 10 degree or 180-10 degree with the horizontal
ok...but how do i apply 170 in this triangle|dw:1333533509958:dw|
(im more familiar with that format)
|dw:1333522738607:dw|
Like
|dw:1333533595849:dw|Like I understand how it applies outside, but how do i calculate the angle within?
30N is parallel to horizontal
|dw:1333522901720:dw|
oh. the z,c, f pattern. got it.
what's our next step then, cos law?
yep ... we have all parameters required to calculate
|dw:1333525849053:dw| another way of looking at it
\[x^{2} = 25^{2}+30^{2}-2(25)(30)\cos 170\]
thank you! i hadnt thought of this
hey guys. I'm having problems figuring out the angle (again!)
I manged to get 5.4 degrees (the closest yet!), while the actual answer is 4.5 degrees.
i did so by using sin-1(30sin170/54.8)
Yea he is correct
what?
What they all said to you is correct
yeah, but i still got the wrong angle...
How so? Have you tried Tan,Cos, and Sin?
the trig ratios? it only applies to right angle triangles...doesnt it?
Not if I re-call
Sorry if I sound incredulous, but I really do think it applies only to right angle triangles.
Do you have notes? If soo check to make sure.
i dont have the notes specifically on that (its buried in a box somewhere); ill check the internet.
http://wiki.answers.com/Q/Can_trig_ratios_only_be_used_on_right_triangles http://library.thinkquest.org/20991/alg2/trig.html
There you go then =D
but...i can't use it here...(unless i do component method, which im not allowed to)
Which methods do you recall :)?
you need to use Law of Sines \[\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}\]
yeah. i used that and got 5.4 degrees.
@dumbcow yeah. i used that and got 5.4 degrees.
hello?
ok the 5.4 degrees is the angle inside the triangle, they want the angle of resultant vector --> 10 - 5.45 = 4.55
thanks again

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