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Which of them is not correct?

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in Engineering Mechanics by (701k points)
Which of them is not correct?

(a) j x j = 0

(b) j x k = i

(c) j x i = k

(d) j x i = -k

I had been asked this question in a job interview.

My doubt is from Dot Product and Cross Product in portion Force Vectors of Engineering Mechanics

1 Answer

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

To elaborate: As asked, the one which is not correct is the third one. The product is containing the cosine function, and the angle which is going to be inserted in the function is the angle between the vectors. Thus if the angle is 90, then the cross will be zero.

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