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The angle between vecF =(1,-3, 1)and vec...

The angle between `vecF =(1,-3, 1)`and `vecd =(2,-3,-11)` will b e ...... rad.

A

0

B

`(pi)/(4)`

C

`(pi)/(2)`

D

`pi`

Text Solution

Verified by Experts

The correct Answer is:
C
`cos theta = (vec(F).vec(D ))/(Fd ) = ((1,-3,-1).(2,-3,-11))/(sqrt(11)sqrt(134))`
`cos theta = (2+ 9 - 11)/(sqrt(11) squr(134))`
`=(0)/(sqrt(1474))`
`=0`
`theta = (pi)/(2)`
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