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If vec a and vec b be two non-collinear...

If ` vec a` and `vec b` be two non-collinear unit vector such that ` vec axx( vec axx vec b)=1/2 vec b ,` then find the angle between ` vec a` and `vec b`.

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`vecaxx (vecaxxvecb) =1/2 vecb Rightarrow(veca.vecb)veca-(veca.veca) vecb= 1/2vecb`
`Rightarrrow veca.vecb = 0 , veca. Veca = -1/2 ` ( which is not possible).
thus, the given information is inconsistent.
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CENGAGE PUBLICATION-DIFFERENT PRODUCTS OF VECTORS AND THEIR GEOMETRICAL APPLICATIONS -Exercise 2.3
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  2. prove that if [vecl vecm vecn] are three non-coplanar vectors, then [v...

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  3. If the volume of a parallelepiped whose adjacent edges are vec a=2...

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  4. If veca=hati+hatj + hatk and vecb = hati - 2 hatj+hatk then find the v...

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  5. If vecx.veca=0 vecx.vecb=0 and vecx.vecc=0 for some non zero vector ve...

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  6. If veca=hati+hatj + hatk and vecb = hati - 2 hatj+hatk then find the v...

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  7. If veca, vecb,vecc are three non-coplanar vectors such that veca xx ve...

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  8. If veca= vecP + vecq, vecP xx vecb = vec0 and vecq. vecb =0 then prove...

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  9. Prove that (veca.(vecbxxhati))hati+(veca.(vecbxxhatj))hatj+ (veca.(vec...

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  10. For any four vectors, vec a , vec b , vec c and vec d prove that vec...

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  11. If vec a and vec b be two non-collinear unit vector such that vec ...

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  12. show that (vecaxxvecb)xxvecc=vecaxx(vecbxxvecc) if and only if veca a...

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  13. Let veca,vecb and vecc be the non zero vectors such that (vecaxxvecb)x...

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  14. If vec p , vec q , vec r denote vector vec bxx vec c , vec cxx vec a...

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  15. Let veca, vecb , vecc be non -coplanar vectors and let equations veca'...

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  16. Given unit vectors hat m , hat n and hat p such that angel between h...

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  17. veca,vecb, vecc are threee unit vectors and every two are two inclined...

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  18. Let veca=a(1)hati+a(2)hatj+a(3)hatk,vecb=b(1)hati + b(2)hatj + b(3)hat...

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