Kinematics Question 603

Question: The vector having magnitude equal to 3 and perpendicular to the two vectors A=2i^+2j^+k^ and B=2i^2j^+3k^ it’s:

Options:

A) ±(2i^j^2k^)   

B)±(3i^+j^2k^)

C) (3i^+j^3k^) 

D)(3i^j^3k^)

Show Answer

Answer:

Correct Answer: A

Solution:

[a] The required vector is, =3(A×B)|A×B|=3[(2i^+2j^+k^)×(2i^2j^+3k^)]|A×B|

=3(8i^4j^8k^)82+42+82=2i^j^2k^.



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