SOLUTION: find a dot b for a = <1,3> and magnitude b =5 and the angle between these vectors is 120 degrees.
Algebra.Com
Question 289125: find a dot b for a = <1,3> and magnitude b =5 and the angle between these vectors is 120 degrees.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Hint: Recall that the angle between two vectors 
and 
, let's call it 
, can be represented in the equation:
 = \frac{\vec{a}\cdot\vec{b}}{\|\vec{a}\|\|\vec{b}\|})
where 
is the magnitude of and 
is the magnitude of .
RELATED QUESTIONS
TRIGONOMETRY
B. Magnitude of Vectors
3. Find the magnitude and direction of the sum w... (answered by MathLover1)
B. Magnitude of Vectors (Trigonometry)
3. Find the magnitude and direction of the sum w... (answered by CPhill)
Two vectors a and B have components in arbitrary units ax=3.2, ay= 1.6, bx=0.50, by=4.5... (answered by ikleyn)
Question – 5: Consider the vectors,a=12i + 2j, b= -2i + 3j, and c = a-b
(a) Find the... (answered by stanbon)
The angle between two vectors, u and v, is 30 degrees and the dot product is 24. If the... (answered by amarjeeth123)
TRIGONOMETRY
B. Magnitude of Vectors
1. Find the magnitude of the Vector ML if point M... (answered by Alan3354)
Find the interior angles of the triangle ABC whose vertices are the points; A[-1,0,2]... (answered by scott8148)
If vectors a, b and c are mutually perpendicular of equal magnitude, then find the angle... (answered by Alan3354)
B. Magnitude of Vectors (Trigonometry)
2. Find the magnitude of the x- and y-... (answered by CPhill)