Question

5. A tungsten bar of square cross section 20 mm x 20 mm and of length 600 mm is subjected to a tensile force of 90,000 N. Young's modulus of tungsten is 411.0 GPa and Poisson's ratio is 0.280. Determine (a) the engineering stress; (b) the clongation; (c) the engineering strain; (d) the change in the crosssection area of the bar. 6. Sodium is a metal with a cubic A2 (BCC) structure (Fig. 4) and the lattice constant a-0.428 nm. Calculate the planar density of atoms (the number of atoms per nm2) for the following planes: a. (100) b. (110) c. (T11) d. (120) Fig. I Fig.4 sto Since such books o m is, of course, prima facie eviden the possession of the No pages are to be torn from this book ter not intended for correction by the teacher should be the book should not be mutilated in any TEXAS IN

plz do question 5