A cylinder of inner radius a and outer radius na, where n is an integer, has been designed to resist a specific internal pressure, but reboring becomes necessary. (a) Find the new inner radius rx required so that the maximum tangential stress does not exceed the previous value by more than while the internal pressure is the same as before. (b) If a=25mm and n=2 and after reboring the tangential stress is increased by 10%, determine the new diameter.
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