Both Bob and Mary exert forces on a box. Bob exerts a force of 17.0 N, 23.0° south of east, and Mary exerts a force of 23.0 N. 36.0° west of south. No other forces act on the box. Calculate the net force acting on the box, expressing the direction relative to east or west.

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.