Is the pair of vectors i + 5 j and 5 i + j perpendicular?
A)yes
B)no

Name: Is the pair of vectors i + 5 j and 5 i + j perpendicular? A)yes B)no
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Question

Is the pair of vectors i + 5 j and 5 i + j perpendicular? ​
A)yes
B)no

Quizplus · Accepted Answer

Two vectors are perpendicular if and only if their dot product is equal to zero. 
(i + 5j) · (5i + j) = 5i^2 + i * 5j + 5j * 5i + 1 * j^2 = 5 + 25 + 1 = 31 ≠ 0. 
Therefore, i + 5j and 5i + j are not perpendicular.

Is the Pair of Vectors I + 5 J and 5