Write the direction ratio’s of the vector and hence calculate its direction cosines.

Asked by Topperlearning User | 13th Aug, 2016, 01:24: AM

Expert Answer:

The direction ratios of the vector are 1, 2, – 3 and 

t h e space d i r e c t i o n space cos i n e s space a r e space fraction numerator 1 over denominator square root of 1 plus 4 plus 9 end root end fraction comma fraction numerator 2 over denominator square root of 1 plus 4 plus 9 end root end fraction comma fraction numerator negative 3 over denominator square root of 1 plus 4 plus 9 end root end fraction rightwards double arrow fraction numerator 1 over denominator square root of 14 end fraction comma fraction numerator 2 over denominator square root of 14 end fraction comma fraction numerator negative 3 over denominator square root of 14 end fraction.

Answered by  | 13th Aug, 2016, 03:24: AM