You have hung a 0.500 kg mass from the end of a 1.00 m long pendulum and suspended it from the end of a force sensor so that it is at equilibrium. You tare the force sensor. You then set the pendulum in motion. At the bottom of the motion, the sensor reads -1.96 N. What is the magnitude of the centripetal force, in N?

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.