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@IrishBoy123 Please help!!! :)
But how do i find the angle?????
@welshfella can you help me?!?!?!? O_o
lotta drawings here, all look different. is there a scan or link to question?
ok please wait....:)
why do you think the asnwer is 25N ???
it looks pretty obvious.....doesn't it....do you want me to show you how i got it???
yes pls show!
question 10N down 8N up how is that 18N down shouldn't it be 2N down?!
try to find the hypotenuse like that....
forget about hypoteneuses for the minute do you have a book answer if it is 18N down the answer is 32.33N if it is 2N as it should be the answer still isn't 25N do you know the law of cosines??? cos that makes this really easy
why your using cosine here doe????
"law of cosines" ring a bell ?!?!
yes but first tell me what does the hexagon means on the diagram????
isn't that the shape of the body? i have never seen it before! i am about to post a few drawings. bear with me
if the diagram is right, this is how you do it you must resolve the 17N force in the x and y directions
is it ....C^2 = A^2 + B^2-2abCos45???
yeah! do you actually know that law?!?! cos it makes life really easy this easy http://www.wolframalpha.com/input/?i=%2817%5E2+%2B+2%5E2+-+2%2817%29%282%29cos+135%29%5E%281%2F2%29
yah....well kinda...ok but please tell me under what scenario do i use the sin law in questions such as these......or do we ever use the sin law in these type of questions?
because i haven't done a single question that uses sin law instead of cos.
you need to know more angles to use the law of sines, though it is a much easier rule to apply look at this https://gyazo.com/75c2ae6ed28fa5e3109a4e87a4775967
ok Thanks hun.....just one last thing.....to find the angle, we use sinA/a + SinB/b = SinC/c right???????????/
i meant sinA/a = SinB/b = SinC/c
yes, that is the law of sines but the question does not want the direction of the force, just its magnitude
i think we shoukd just resolve the 17N force in the x and y direction as i suggested.
yah but for some reason, the examples that i have also include the angle.....so my final answer would be like....suppose 50N (E70S)
but i think in our case the angle would be 45degree right??????
we can do the angle but using simple trig id's did you follow the drawing hwere the 17N is resolved in x and y directions, cos that is a few steps off getting us done.
the final angle will not be 45deg
oh you sohcahtoa..
now you can use pythagoreas etc
ok so now i can apply the pythangorem theorem right....
ok Thanks alot... :)
forgive me for the impertenance (!!!) but did you follow the resolving of the 17N
17 cos 45 up, 17sin45 to the left
hey sorry, i went to take a d....p but yah so 17sin 45 will give me the angle on x-axis and 17cos45 will give me the angle on the y-axis????