Find the angle 𝜃 (in radians) between the vectors. (Round your answer to two decimal places.)u = 4i − 5jv = i − 5j
Question
Find the angle (in radians) between the vectors. (Round your answer to two decimal places.)
Solution
The angle θ between two vectors u and v can be found using the dot product formula:
u . v = ||u|| ||v|| cos(θ)
where:
- u . v is the dot product of u and v
- ||u|| is the magnitude of vector u
- ||v|| is the magnitude of vector v
First, calculate the dot product of u and v:
u . v = (4i - 5j) . (i - 5j) = 41 + (-5)(-5) = 4 + 25 = 29
Next, calculate the magnitudes of u and v:
||u|| = sqrt((4)^2 + (-5)^2) = sqrt(16 + 25) = sqrt(41) ||v|| = sqrt((1)^2 + (-5)^2) = sqrt(1 + 25) = sqrt(26)
Then, substitute these values into the dot product formula and solve for θ:
cos(θ) = (u . v) / (||u|| ||v||) = 29 / (sqrt(41) * sqrt(26))
θ = arccos(29 / (sqrt(41) * sqrt(26)))
Finally, use a calculator to find the arccos of the value. Make sure your calculator is set to radians. Round your answer to two decimal places.
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