A wheel (J )of radius IS tangentially (l) by two forces: F, = 100 N and F2 = 200 N as shown in the adjacent figure. If the moment of inertia of the wheel about an axis tha is perpendicular on the plane of the wheel and passes through its center is 15 kg.m2, the magnitude of the wheel's angular acceleration (in rad/s²) is: %3D %3D

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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.