Posted by **Colin** on Sunday, January 20, 2013 at 3:22pm.

Vector A has a magnitude of 5.00 units, vector has a magnitude of 5.00 units, and the dot product A·B has a value of 16. What is the angle between the directions of A and ?

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**Elena**, Monday, January 21, 2013 at 4:03pm
A•B= |A||B| cosα

cosα =A•B/ |A||B|=

=16/5•5=0.64

α=cos⁻¹α=50.2°

- Physics -
**Rachel**, Tuesday, January 29, 2013 at 7:40pm
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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