YumYum247
  • YumYum247
someone help me!!! :)
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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YumYum247
  • YumYum247
@IrishBoy123 Please help!!! :)
YumYum247
  • YumYum247
|dw:1441322544931:dw|
YumYum247
  • YumYum247
But how do i find the angle?????

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YumYum247
  • YumYum247
@welshfella can you help me?!?!?!? O_o
YumYum247
  • YumYum247
|dw:1441323071374:dw|
IrishBoy123
  • IrishBoy123
lotta drawings here, all look different. is there a scan or link to question?
YumYum247
  • YumYum247
ok please wait....:)
IrishBoy123
  • IrishBoy123
why do you think the asnwer is 25N ???
YumYum247
  • YumYum247
it looks pretty obvious.....doesn't it....do you want me to show you how i got it???
IrishBoy123
  • IrishBoy123
yes pls show!
IrishBoy123
  • IrishBoy123
question 10N down 8N up how is that 18N down shouldn't it be 2N down?!
YumYum247
  • YumYum247
try to find the hypotenuse like that....
IrishBoy123
  • IrishBoy123
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
YumYum247
  • YumYum247
why your using cosine here doe????
IrishBoy123
  • IrishBoy123
"law of cosines" ring a bell ?!?!
YumYum247
  • YumYum247
yes but first tell me what does the hexagon means on the diagram????
IrishBoy123
  • IrishBoy123
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
IrishBoy123
  • IrishBoy123
|dw:1441324012164:dw|
YumYum247
  • YumYum247
|dw:1441323811136:dw|
IrishBoy123
  • IrishBoy123
|dw:1441324028314:dw|
IrishBoy123
  • IrishBoy123
if the diagram is right, this is how you do it you must resolve the 17N force in the x and y directions
YumYum247
  • YumYum247
is it ....C^2 = A^2 + B^2-2abCos45???
IrishBoy123
  • IrishBoy123
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
YumYum247
  • YumYum247
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?
YumYum247
  • YumYum247
because i haven't done a single question that uses sin law instead of cos.
IrishBoy123
  • IrishBoy123
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
YumYum247
  • YumYum247
ok Thanks hun.....just one last thing.....to find the angle, we use sinA/a + SinB/b = SinC/c right???????????/
YumYum247
  • YumYum247
i meant sinA/a = SinB/b = SinC/c
IrishBoy123
  • IrishBoy123
yes, that is the law of sines but the question does not want the direction of the force, just its magnitude
IrishBoy123
  • IrishBoy123
i think we shoukd just resolve the 17N force in the x and y direction as i suggested.
YumYum247
  • YumYum247
yah but for some reason, the examples that i have also include the angle.....so my final answer would be like....suppose 50N (E70S)
YumYum247
  • YumYum247
but i think in our case the angle would be 45degree right??????
IrishBoy123
  • IrishBoy123
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.
IrishBoy123
  • IrishBoy123
the final angle will not be 45deg
IrishBoy123
  • IrishBoy123
|dw:1441324840879:dw|
YumYum247
  • YumYum247
oh you sohcahtoa..
IrishBoy123
  • IrishBoy123
now you can use pythagoreas etc
YumYum247
  • YumYum247
ok so now i can apply the pythangorem theorem right....
YumYum247
  • YumYum247
ok Thanks alot... :)
IrishBoy123
  • IrishBoy123
forgive me for the impertenance (!!!) but did you follow the resolving of the 17N
IrishBoy123
  • IrishBoy123
17 cos 45 up, 17sin45 to the left
IrishBoy123
  • IrishBoy123
cool!
YumYum247
  • YumYum247
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????
YumYum247
  • YumYum247
|dw:1441325684118:dw|

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