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If hat a , hat b ,a n d hat c are three...

If ` hat a , hat b ,a n d hat c` are three unit vectors, such that ` hat a+ hat b+ hat c` is also a unit vector and `theta_1,theta_2` and `theta_3` are angles between the vectors ` hat a , hat b ; hat b , hat ca n d hat c , hat a` respectively, then among `theta_1,theta_2` and `theta_3`. a. all are acute angles b. all are right angles c. at least one is obtuse angle d. none of these

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CENGAGE PUBLICATION-VECTOR ALGEBRA-All Questions
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  2. Two adjacent sides of a parallelogram A B C D are 2 hat i+4 hat j-5 ...

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  3. If hat a , hat b ,a n d hat c are three unit vectors, such that ha...

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  4. If vec a , vec b , vec c are unit vectors such that vec a. vec b=0= ...

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  7. vec a , vec b , and vec c are three vectors of equal magnitude. The an...

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  8. Let vec pa n d vec q be any two orthogonal vectors of equal magnitu...

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  9. Let vec aa n d vec b be two non-collinear unit vector. If vec u= vec...

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  10. The vertex A triangle A B C is on the line vec r= hat i+ hat j+lambda...

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  15. In a quadrilateral A B C D , vec A C is the bisector of vec A Ba n d ...

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  16. Position vector hat k is rotated about the origin by angle 135^0 in...

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  17. A non-zero vector vec a is such that its projections along vectors ...

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  18. Let vec a=2 hati+hat j+ hat k , vec b=hat i+2hat j- hatk and a unit v...

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