Write the length (magnitude) of a vector whose projections on the coordinate axes are 12, 3 and 4 units.

Question

Philoid · Accepted Answer

Since L_x=12, L_y=3 and L_z=4 are given, we can find out L by

L²= L_x²+L_y²+L_z²

=12²+3²+4²

=144+9+16=169

Hence L=13 units.