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If the position vectors of P\ a n d\ Q a...

If the position vectors of `P\ a n d\ Q` are ` hat i+3 hat j-7 hat k\ a n d\ 5 hat i-2 hat j+4 hat k` them the cosine of the angle between ` vec P Q` and y-axis is `5/(sqrt(162))` b. `4/(sqrt(162))` c. `-5/(sqrt(162))` d. `(11)/(sqrt(162))`

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RD SHARMA ENGLISH-SCALAR OR DOT PRODUCT-All Questions
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  2. The vector cosalpha\ cosbeta hat i+cosalpha\ s inbeta hat j+sinalpha h...

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  3. If the position vectors of P\ a n d\ Q are hat i+3 hat j-7 hat k\ a n...

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  4. If vec a\ a n d\ vec b are unit vectors, then which of the following...

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  5. If the vectors hat(i) - 2x hat(j) + 3 y hat(k) and hat(i) +2x hat(j) ...

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  7. The length of the longer diagonal of the parallelogram constructed o...

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  8. If vec(a) is a non zero vector of magnitude 'a' and lambda a non zero ...

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  9. If theta is the angle between two vectors vec(a) and vec(b), then vec(...

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  10. The value of x for which the angle between vec a=2x^2 hat i+4x hat ...

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  11. If vec a ,\ vec b ,\ vec c are any time mutually perpendicular vect...

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  12. If the vectors 3 hat i+lambda hat j+ hat k\ a n d\ 2 hat i- hat j+8 ha...

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  13. The projection of the vector hat i+ hat j+ hat k along the vector ...

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  14. The vectors 2 hat i+3 hat j-4 hat k\ a n d\ a hat i=b hat j+c hat k ar...

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  15. If | vec a|=| vec b|,\ t h e n\ ( vec a+ vec b)dot( vec a- vec b)= a....

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  16. If vec a\ a n d\ vec b are unit vectors inclined at an angle theta t...

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  17. If vec a\ a n d\ vec b are unit vectorts, then the greatest value fo...

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  18. If the angle between the vectors x hat i+3 hat j-7 hat k\ a n d\ x hat...

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  19. If \ vec a\ a n d\ vec b are two unit vectors inclined at an angle t...

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  20. Let vec a ,\ vec b ,\ vec c be three unit vectors such that | vec a...

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