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If 4veca+5vecb+9vecc=0 " then " (vecaxxv...

If `4veca+5vecb+9vecc=0 " then " (vecaxxvecb)xx[(vecbxxvecc)xx(veccxxveca)]` is equal to

A

a vector perpendicular to the plane of `veca, vecb and vecc`

B

a scalar quantity

C

`vec0`

D

none of these

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The correct Answer is:
c
`4 veca + 5 vecb + 9 vecc =0`
`Rightarrow "vcectors" veca,vecb and vecc` are coplanar.
`Rightarrow vecb xx vecc and vecc xx veca` are collinear.
`Rightarrow (vecb xx vecc) xx (vecc xx veca) = vec0`
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CENGAGE ENGLISH-DIFFERENT PRODUCTS OF VECTORS AND THEIR GEOMETRICAL APPLICATIONS -Exercises MCQ
  1. Let vecr, veca, vecb and vecc be four non -zero vectors such that vecr...

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  2. If veca, vecb and vecc are such that [veca \ vecb \ vecc] =1, vecc= la...

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  3. If 4veca+5vecb+9vecc=0 " then " (vecaxxvecb)xx[(vecbxxvecc)xx(veccxxve...

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  4. value of [vecaxxvecbvecaxxvecc vecd] is always equal to

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  5. Let hata and hatb be mutually perpendicular unit vectors. Then for an...

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  6. Let veca and vecb be unit vectors that are perpendicular to each other...

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  7. veca and vecb are two vectors such that |veca|=1 ,|vecb|=4 and veca. V...

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  8. If vecb and vecc are unit vectors, then for any arbitary vector veca,...

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  9. If veca .vecb =beta and veca xx vecb = vecc ," then " vecb is

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  10. If a(vecalphaxxvecbeta)=b(vecbetaxxvecgamma)+c(vecgammaxxvecalpha)=vec...

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  11. if (vecaxxvecb)xx(vecbxxvecc)=vecb, " where " veca, vecb and vecc are ...

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  12. If vecr.veca=vecr.vecb=vecr.vecc=1/2 for some non zero vector vecr and...

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  13. A vector of magnitude 10 along the normal to the curve 3x^2+8x y+2y...

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  14. If veca and vecb are two unit vectors inclined at an angle pi/3 then {...

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  15. If veca and vecb are othogonal unit vectors, then for a vector vecr no...

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  16. If veca+vecb ,vecc are any three non- coplanar vectors then the equa...

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  17. Sholve the simultasneous vector equations for vecx and vecy: vecx+vecc...

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  18. The condition for equations vecrxxveca = vecb and vecr xx vecc = vecd ...

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  19. If veca=2hati + hatj + hatk, vecb=hati + 2hatj + 2hatk then [veca vecb...

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  20. If veca=2hati + hatj+ hatk, vecb= hati+ 2hatj + 2hatk,vecc = hati+ hat...

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