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1. Aug 17, 2016

Pao44445

1. The problem statement, all variables and given/known data

find the scale of R and angle
2. Relevant equations

Vector A = 100
Vector B = 200
3. The attempt at a solution
I know that I need to find the answer of this equation "R = A+B" but I can't find Bx and By because of the angle

Last edited by a moderator: Sep 16, 2016
2. Aug 17, 2016

Staff: Mentor

Why not?

3. Aug 17, 2016

andrevdh

Don't understand your problem just apply magnitude of B x sine or cosine of the angle?

4. Aug 18, 2016

Pao44445

I am not good at trigonometry :/ Does Bx=200cos240?

5. Aug 18, 2016

Student100

Yes, but you should work on your trig skills. Maybe it would be easier for you to think about it as a 60 degree angle in the third quadrant, which is negative for both sine and cosine.

6. Aug 18, 2016

andrevdh

When you resolve a vector into it components you may position its tail at the origin of the coordinate system or alternatively place a x-y coordinate system at is tail.

7. Aug 18, 2016

lychette

because he/she does not know how?
any help?

8. Aug 18, 2016

Staff: Mentor

I wanted the OP to say what was different about B that led to a problem. (Supposedly vector A did not present a problem, but B did.)

In any case, the question was answered.

9. Aug 18, 2016

lychette

no harm done

10. Sep 16, 2016

sukalp

i wanted to tell you you said we will not need by and bx but when angle is given of 2 vector we will need bx and by by that only i will be able to calculate components of x and y vector and add them and find resultant