A particle is suspended from a point A by an inextensible string of length L. It is projected from B with a velocity V, perpendicular to AB, which is just sufficient for it to reach C. A (a) Show that, if the string is just to be taut when the particle reaches C, its speed there is (gL). (b) Find the speed V with which the particle should be projected from B. V. B (c) At which point of the circular path is the string most likely to break?

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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.