A cylindrical bar of metal having a diameter of 18.9mm and a length of 190mm is deformed elastically in tension with a force of 54000N. Given that the elastic modulus and Poisson's ratio of the metal are 67.0GPa and 0.33, respectively, determine the following: (a) The amount by which this specimen will elongate in the direction of the applied stress. (b) The change in diameter of the specimen. Indicate an increase in diameter with a positive number and a decrease with a negative number. (a) mm (b) mm