1. A mild steel bar specimen of diameter 20 mm is subjected to a tensile test. The bar was found to yield under a load of 82.5 kN and the specimen attained a maximum load of 155 kN and ultimately broke at a load of 72.5 kN. What is the tensile stress on the yield point?

2. A mild steel bar specimen of diameter 20 mm is subjected to a tensile test. The bar was found to yield under a load of 82.5 kN and the specimen attained a maximum load of 155 kN and ultimately broke at a load of 72.5 kN. What is the ultimate stress?

3. A mild steel bar specimen of diameter 20 mm is subjected to a tensile test. The bar was found to yield under a load of 82.5 kN and the specimen attained a maximum load of 155 kN and ultimately broke at a load of 72.5 kN. What is the average stress at the breaking point if the diameter of the neck is 10.75 mm?