An iron bolt of mass 60.0 g hangs from a string 30 cm long. The top end of the string is fixed. Without touching it, a magnet attracts the bolt so that it remains stationary but is displaced horizontally 28 cm to the right from the previously vertical line of the string. The magnet is located to the right of the bolt and on the same vertical level as the bolt in the final configuration. a. Draw the free-body diagram of the bolt. b. Find the tension in the string and the magnetic force on the bolt.

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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.