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Find the value of x for which the angle ...

Find the value of `x` for which the angle between the vectors ` vec a=2x^2 hat i+4x hat j+ hat k\ a n d\ vec b=7 hat i-2 hat j+x hat k` is obtuse.

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RD SHARMA ENGLISH-SCALAR OR DOT PRODUCT-All Questions
  1. Show that the points A, B, C with position vectors 2 hat i- hat j+ ...

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  2. If with reference to a right handed system of mutually perpendicula...

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  3. Find the value of x for which the angle between the vectors vec a=2x^...

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  4. If l ,\ m ,\ n are scalars and vec a ,\ vec b ,\ vec c are vectors,...

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  5. If vec a ,\ vec b ,\ vec c are three mutually perpendicular vectors...

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  6. Let vec a ,\ vec b ,\ vec c be three vectors of magnitudes 3, 4 and...

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  7. If vec a ,\ vec b ,\ vec c are unit vectors such that vec a+ vec b...

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  8. Three vectors vec a ,\ vec b ,\ vec c satisfy the condition vec a+...

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  9. Find vec adot vec b when: vec a= hat i-2 hat j+ hat k\ a n d\ vec b...

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  10. Find vec adot vec b when: vec a= hat j+2 hat k\ a n d\ vec b=2 hat ...

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  11. Find vec adot vec b when: vec a= hat j- hat k\ a n d\ vec b=2 hat i...

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  12. For what value of lambda are the vector vec a\ a n d\ vec b perpendi...

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  13. For what value of lambda are the vector vec a\ a n d\ vec b perpendi...

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  14. For what value of lambda are the vector vec a\ a n d\ vec b perpendi...

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  15. For what value of lambda are the vector vec a\ a n d\ vec b perpendi...

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  16. If vec a\ a n d\ vec b are two vectors such that | vec a|=4,\ | vec ...

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  17. If vec a= i- j and vec b=- j+2k ,find (vec a-2 vec b)dot( vec a+ v...

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  18. Find the angle between the vectors vec a\ a n d\ vec b where: vec a...

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  19. Find the angle between the vectors vec a\ a n d\ vec b where: vec a...

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  20. Find the angle between the vectors vec a\ a n d\ vec b where: vec a...

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