Posted by Colin on Sunday, January 20, 2013 at 3:22pm.
A•B= |A||B| cosα
cosα =A•B/ |A||B|=
=16/5•5=0.64
α=cos⁻¹α=50.2°
A person walks in the following pattern: 2.8 km north, then 2.7 km west, and finally 6.9 km south. Construct the vector diagram that represents this motion and from it judge how far and in what direction a bird would fly in a straight line from the same starting point to the same final point. (Choose east as the +x direction.)
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