Vector A⃗ has a magnitude of 4.0 units in the negative y direction. Vector B⃗ has...
Vector A⃗ has a magnitude of 4.0 units in the negative y direction. Vector B⃗ has a positive x component of 4.0 units and a negative y component of 9.0 units.
A) What is the angle between the vectors?
B) Determine A⃗ * B⃗
Homework Answers
Let us write the vectors in unit vector notation,
A=-4j
And B=4i-9j
(A)Now we know that dot product of two vectors is
So,
=23.960
(b)
A*B is the cross product of two vectors,
A*B=(-4j)*(4i-9j)
=(-4*4)(j*i)
=16 k
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