Q.5.3 What is accuracy in measurement? Q 5.15 Define nominal surface. Q6.4 What is an alloy? The copper-nickel system is a simple alloy Q6.8 system, as indicated by its phase diagram. Why is it so simple? Using the lead-tin phase diagram in Figure 6.3, determine the liquid and solid P 6.3 phase compositions for a nominal composition of 90% Sn and 10% Pb at 204C (400F). Provide a correct definition with detail. (1) Provide a correct definition with detail; (2) give at least 3 examples that represent nominal surface in drawings. Part of the solution to this question is provided in the e- textbook. However, you need to (1) provide a correct definition with detail and (2) explain briefly how to make an alloy. Explain it in your own words to include all the key points. Part of the solution to this question is provided in the e- textbook. However, you need to (1) make marks and label on the phase diagram to show how you obtain the readings, and (2) write down your answer