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  • Sum of length of projections of <img alt="\vec{a}=-2\hat{i}-3\hat{j}+7\hat{k}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cvec%7Ba%7D%3D-2%5Chat%7Bi%7D-3%5Chat%7Bj%7D&plus;7%5Chat%7

Sum of length of projections of \vec{a}=-2\hat{i}-3\hat{j}+7\hat{k} on co-ordinate axes is

Option: 1

10


Option: 2

11


Option: 3

12


Option: 4

13


Answers (1)

best_answer

Length of projection on x-axis = \left | -2 \right |=2

Length of projection on y-axis = \left | -3 \right |=3

Length of projection on z-axis = \left | 7 \right |=7

\therefore Sum of length of projections = 2+3+7=12
so, Option (C)

Posted by

Pankaj Sanodiya

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