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Which of the following is true? (a)i x i =1

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in Engineering Mechanics by (701k points)
Which of the following is true?

(a) i x i =1

(b) j x i = -j

(c) k x j = -i

(d) k x k = 1

The question was posed to me during an interview for a job.

The origin of the question is Dot Product and Cross Product topic in portion Force Vectors of Engineering Mechanics

1 Answer

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Best answer
The correct option is (c) k x j = -i

Easy explanation: As the mathematic equation for the cross product is having a cosine function in it, in which the angle used in the function is the angle between the vectors. Thus the cross product will be zero if the angle between them is 90.

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