Find ‘a’ if  A = 3i - 2j + 4k and B = ai + 2j - k are perpendicular to one another.

Find ‘a’ if  A = 3i - 2j + 4k and B = ai + 2j - k are perpendicular to one another.
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Find ‘a’ if A = 3i - 2j + 4k and B = ai + 2j - k are perpendicular to one another.
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A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force - F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j - 4k in kg units the moment of the couple in kg - m units would be a.8i - 6j - 3k b.12i - 3j + k c.16i - 12j - 6k d.4i - 3j + k e.8i + 5j + 3k

Description : A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force - F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j - 4k in kg units the moment of the couple in kg - m ... .8i - 6j - 3k b.12i - 3j + k c.16i - 12j - 6k d.4i - 3j + k e.8i + 5j + 3k

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