Questions
If A=4i-2j+6k and B=i-2j-3k, the angle which the A + B makes with X-axis is
a
cos−1(3/50)
b
cos−1(5/50)
c
cos−1(4/50)
d
cos−1(12/50)
detailed solution
Correct option is B
A+B=5i-4j+3kand |A+B|={(25)+(16)+9}(A+B).i=52or |A+B|cosθ=5∴50cosθ =5or θ =cos−1(5/50) = 450Talk to our academic expert!
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A vector rotated about its tail through an angle 450 in clockwise direction. Then the new vector is
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