QUESTION 1 Use the Pb-Sn diagram below to answer the following questions. 350 327°C Liquid, L 300 250 232°C Pb-rich 200 solid (Pb) Sn-rich 183°C solid (Sn) 18.3% 61.9% 97.8% 3 150 100 50 Two phase: (Sn) + (Pb) 10 20 30 40 50 60 70 80 90 100 Pb Sn wt.% Sn (a) What are the values of the state variables (composition and temperature) at constitution point 1? (b) Mark the constitution points for Pb-60wt% Sn and Pb-20wt% Sn alloys at 2500C. What phases are present in each case? (c) The alloy at constitution point 1 is cooled very slowly to room temperature, maintaining equilibrium. At which temperatures do changes in the number or type of phases occur? What phases are present at constitution points 2 and 3? (d) The alloy at constitution point 4 is cooled slowly to room temperature. Identify the following: (i) the initial composition, temperature and phase(s); (ii) the temperature at which a phase change occurs, and the final phase(s). Temperature, T (°C)

A steel pipe with an outside diameter of 95 mm and an inside diameter of 85 mm supports the loadings shown in the next figure. Investigate the stresses on the top surface of the pipe at point H and on the side of the pipe at point K. 240 mm 7 kN 10 kN 450 mm 14 kN H K Compute: a) max. tensile and shear stresses at point H b) max. tensile and shear stressed at point K

A sharp knife can cut because the pressure increases when a) the surface of contact is small b) the surface of contact is large c) when we apply a large force on it regardless of the surface of contact d) both the surface of contact and the force are large

Help with the questions: 1- Continuity tells us that whatever the volume of fluid in a pipe passing a particular point per second, the same volume must pass every other point in a second. The fluid is not accumulating or vanishing along the way. A) True B) False 2- When a fluid moves from a wider area of a pipe to a narrower one, its speed increases. A) True B) False 3- A fluid exerts a net upward force on any object it surrounds, called the buoyant force. A) True B) False