1.

Find the direction cosines and direction rations for the followingvectors (i)3 hati - 4hatj + 8 hatk (ii)3hati + hatj + hatk (iii)hatj (iv)5 hati - 3hatj - 48 hatk (v)3hati - 3hatk+ 4 hatj (vi)hati -hatk OR ( b) Showthat the pointswhoseposition vectors 4hati + 5hatj + hatk , - hatj - hatk , 3 hati + 9 hatj+ 4hatk and- 4 hati + 4 hatj + 4 hatk are conplanar.

Answer»


Answer :(i) `8/sqrt(79)`
(ii) ` sqrt 11`
(III)0,1,0
(IV) `sqrt( 2338)`
(v)`sqrt(34)`
(vi) ` (-1)/SQRT2`
(b) 3


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