So im trying to solve those basic questions preping for my finals

So im trying to solve those basic questions preping for my finals...

i have solutions, but i dont understand the logic behind how they got the answer

...

What's there not to understand?

[math]\vec{F}_{R} = \vec{F}_{1} + \vec{F}_{2} = \begin{pmatrix}300\cos(30) - 500\cos(65)\\ -300\sin(30) - 500\sin(65)\end{pmatrix}[/math]

is that suppose to be a matrix ?

Decompose each vector into x and y components. Add components. Solve for the unknown.

Fucking engineers.

matrix notation if you want to call it that I guess. It's a vector so I don't have to write out [math]\hat{u}, \hat{v}[/math] with a super long expression.

that doesn't work i love your ego calling me a fucking engineer
the sin(x) cos(x) only work for 90 cases such as a x-y plane. in this case it doesn't and wont give you the same answer.

clear your fucking ego cunt and think before you give an answer.

You are a fool. Your retort doesn't even make grammatical sense.

Yes you can decompose it, silly engineering freshman.

ill try and tell you what i get .

>failing this hard in everything
You should drop any sort of intelectual activity.

not understanding or not being able to see a certain aspect doesn't mean a student has to drop what he is doing.

your the sort of person that quits as soon as he can't get the answer blaming it on genetics or some bullshit.

unless you are another troll, then haha you are very funny and edgy...

>Defending some retard who thinks Veeky Forums is his special place to solve homework because he is too autistic to create a stack exchange account.

Yes 2.1 works ...
you were right, Sorry.

Ill try number 2.2 and tell you if its possible using this same method. I was very confident that it was not possible since i had tried solving another similar problem but it wasn't possible.

try doing 2.2
thats when using cos and sin method wont work anymore .

Obviously you will not be able to solve anything if think there is a "cos and sin method" and you are incapable of anything besides plug and chug. Some people just assume you know what a dot product is and call the collection of methods analytical geometry.

ayyy thx senpai

wtf if you write "Fa m" it replaces it with senpai ?

2-2 should be solvable with the same method.

i dont think so. since its asking for different things

You just need to find u / v component. Which is part of the solution in 2-1.

im not seeing how you use the sins thats what im not seeing --> the logic behind there use, im sure its something very basic and when someone tells me ill smack my head in my book. but i dont see how you use them.

why the fuck is
>250sin(30)=c=vsin(105)
>250sin(45)=c=usin(105)

>250sin(30)=vsin(105)
>250sin(45)=usin(105)

Look up Sine Rule and Cosine Rule.
It's more on geometry.

i did and i dont see the triangle they are using to create that connection

i understand using the cosine kaw for q 2.1 part 1 for Fr.

but cant see how they use sine law

Look at , Each forces are in a seperate triangle.

Look how it decomposed the force into uhat and vhat.

will do thx

10/10 bait. look at all the replies

Are you a grill ;)

no

Wow OP are you in elementary school

ok