Good day to you In this particular problem in textbook, essential university physics by richard wolfson volume 1 4th edition. I don't understand how the intersection angle was determined (the 15 degrees one). Much appreciated

Q: Q1) Given points in cylindrical system,: M(2, n, 0), N(1,0, 2),P(3, t/2,1), find: (a) RMN; (b) rM|;…

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A: in this question  we draw a figure i do not have a graph paper so i did on plane paper.

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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.