If upsilon middot w is negative what does this say about the

If upsilon middot w is negative, what does this say about the angle between upsilon and w? Draw a 3-dimensional vector upsilon (an arrow), and show where to find all w\'s with upsilon middot w

Solution

The dot product is a value expressing the angular relationship between two vectors

v.w = |v| x |w| x cos theta

if v.w is negative it means angle between v and w is greater than 90 degrees