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soldier1979 [14.2K]
3 years ago
5

Which one of the following is described fully by its magnitude?

Physics
1 answer:
kompoz [17]3 years ago
5 0
Energy (C) is fully described by its magnitude.
There's nothing else about it to measure. 

The other four things on the list are all vectors.
They need directions to go along with their magnitudes.
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Let us consider two vectors A and B.

As per the question, the two vectors are perpendicular to each other.

Hence the angle between them  \theta =90 degree

We are asked to calculate the resultant of these two vectors.

As per parallelogram law of vector addition, the resultant of two vectors are-

                      R=\sqrt{A^{2}+ B^{2}+2ABcos\theta

                                =\sqrt{ A^{2}+ B^{2}+2AB*cos90}    [cos90=0]

                                =\sqrt{ A^{2}+ B^{2}

This is the way by which we can add two perpendicular vectors.


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