Find the angle between the following two vectors:a⃗ =⟨0,−5⟩𝑎→=⟨0,−5⟩ and b⃗ =⟨1,−4⟩𝑏→=⟨1,−4⟩(Round your answer to the nearest whole degree.)
Question
Find the angle between the following two vectors:
- Vector a:
- Vector b:
(Round your answer to the nearest whole degree.)
Solution
To find the angle between two vectors, we can use the dot product formula:
a⃗ . b⃗ = ||a⃗|| ||b⃗|| cos θ
Where:
- a⃗ . b⃗ is the dot product of vectors a and b
- ||a⃗|| is the magnitude of vector a
- ||b⃗|| is the magnitude of vector b
- θ is the angle between vectors a and b
First, let's calculate the dot product of vectors a and b:
a⃗ . b⃗ = (0 * 1) + (-5 * -4) = 20
Next, let's calculate the magnitudes of vectors a and b:
||a⃗|| = sqrt((0^2) + (-5^2)) = sqrt(25) = 5 ||b⃗|| = sqrt((1^2) + (-4^2)) = sqrt(17)
Now, we can substitute these values into the dot product formula and solve for θ:
20 = 5 * sqrt(17) * cos θ cos θ = 20 / (5 * sqrt(17)) θ = cos^-1(20 / (5 * sqrt(17)))
Calculating this gives θ ≈ 16.26 degrees. Rounding to the nearest whole degree gives θ ≈ 16 degrees.
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