Calculating Resultant Vector with Given Angle and Magnitudes?

[Pao44445]

Homework Statement

find the scale of R and angle

Homework Equations

Vector A = 100
Vector B = 200

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

 

[Doc Al]

but I can't find Bx and By because of the angle

Why not?

 

[andrevdh]

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

 

[Pao44445]

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

 

[Student100]

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

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.

 

[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.

 

[lychette]

Why not?

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

 

[Doc Al]

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

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.

 

[lychette]

no harm done

 

[sukalp]

Homework Statement

find the scale of R and angle

Homework Equations

Vector A = 100
Vector B = 200

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

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