1) Determine the approximate density of a high-leaded brass that has a composition of 64.5 wt% Cu, 33.5 wt% Zn, and 2.0 wt% Pb. The density values for Cu, Zn, and Pb are 8.94 g/cm', 7.13 g/cm', and 11.35 g/cm'. Also, calculate atom percent for each component. (6 points) 2) Compute the number of kilograms of hydrogen that pass per minute through a 6-mm thick sheet of palladium having an area of 0.25 m2 at 600C. Assume a diffusion coefficient of 1.7 x 10-m-/s, that the respective concentrations at the high- and low-pressure sides of the palladium plate are 2.0 and 0.4 kg of hydrogen per cubic meter, steady-state conditions have been attained. (5 points) 3) Nitrogen from a gaseous phase is to be diffused into pure iron at 700C. If the surface concentration is maintained at 0.1 wt% N, what will be the concentration 1 mm from the surface after 10 h? The diffusion coefficient for nitrogen in iron at 700C is 2.5 x 10-11 m/s. (5 points) 4) The diffusion coefficients for silver in copper are given at two temperatures: TCC D (m/s) 650 5.5 x 10-16 900 1.3 x 10-13 (a) Determine the values of Do and Qs (3 points) (b) What is the magnitude of D at 875C? (3 points) 5) Consider a cylindrical titanium wire 3.0 mm in diameter and 2.5 x 10 mm long. Calculate its elongation when a load of 500 N is applied. Assume that the deformation is totally elastie. E -107 GPa (5 points) 6) A cylindrical rod of copper (E = 110 GPa) having a yield strength of 240 MPa is to be subjected to a load of 6660 N. If the length of the rod is 380 mm (15.0 in.), what must be the diameter to allow an elongation of 0.50 mm (0.020 in.)? (5 points)