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veca+veca=veca is (i) always possible, (...

`veca+veca=veca` is (i) always possible, (ii)never possible, (iii)possible if `veca` is a null vector, (iv)possible if `veca` is a unit vector.Which is correct ?

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The correct Answer is:
(iii)
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NN GHOSH-VECTOR AND SCALARS-All Questions
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  2. The resultant of two forces vecP and vecQ acting at O at vecR . If any...

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  3. veca+veca=veca is (i) always possible, (ii)never possible, (iii)possib...

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  4. veca+vecb=vec c and |veca|=|vecb|=|vec c| This is (i)impossible (ii)...

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  5. If veca+vecb=vec c and c=sqrt(a^2+b^2). What is the angle between veca...

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  6. The coordinates of the initial point of a vector are (1,2) and those o...

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  7. If veca=2veci+3vecj and vecb=veci+vecj, find (i)veca.vecb, (ii)vecaxxv...

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  8. If veca=2veci-3vecj+2veck and vecb=veci+2vecj+veck, find (i)veca.vecb,...

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  9. If veca=x1veci+y1vecj and vecb=x2veci+y2vecj, find the condition that ...

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  10. If veca=4veci-3vecj and vecb=6veci+8vecj, find the magnitude and direc...

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  11. Three vectors which are coplanar with respect to a certain reactangula...

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  12. Find the angle between veca=3veci+3vecj-3veck and vecb=2veci+vecj+3vec...

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  13. A car is driven eastward for a distance of 50 km, then northward for 3...

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  14. Four forces of magnitude P, 2P, 3P and 4P act along the four sides of ...

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  15. Find the direction cosines and unit vector along the vector vecr=2veci...

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  16. Prove by the method of vectors that in a triangle a/(sin A)=b/(sinB)=c...

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  17. Show that if vecA. (vecBxxvec c)=0, then vecA, vecB and vec c are copl...

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  18. Show that veca.(vecbxxvec c) is equal in magnitude to the volume of th...

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  19. Prove that for a vector veca defined by veca=axveci+ayvecj+azveck, the...

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  20. If vecb and vec c be the intersecting face-diagonals of a cube of edge...

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