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Question
Find the value of p, for which the vectors `veca = 3hati + 2hatj + 9hatk` and `vecb = hati + phatj + 3hatk` are perpendicular to each other.
Sum
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Solution
`veca * vecb = 0`
`(3hati + 2hatj + 9hatk) * (hati + phatj + 3hatk) = 0`
3 + 2p + 27 = 0
2p = –30
p = –15
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