Explain that walk of a man is the example of resolution of vector.
When a man walks, he pushes the ground with his feet backward at angle θ with the horizontal and man gets equal and opposite reaction Vector can be resolved into two components.
and
So, Horizontal component of helps the man to walk forward.
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Define direction cosines of a vector and show that sum of the square of the direction cosines is equal to unity.
The direction cosines of a vector are the cosine of the angles made by a vector with the positive directions of X, Y and Z-axis. Let a vector