Calculate the net torque about point O for the two forces applied as in the figure below. The rod and both forces are in the plane of the page. Let F = 7.50 N and F = 15.0 N. Take counterclockwise torques to be positive. F2 30.0° K-2.00 m–>*3.00 m– Express your answer in newton-meters. ? N.m DEC 1 11 FIZ FT 80 D00 F9 F10 F6 F7 F8 F3 F4 F5 2$ % & * 4. 7 8 5

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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.