A carbon steel alloy (E= 30´10 6 psi) specimen is undergoing a tensile test. The initial gauge length of the specimen is 1 inch and the initial cross-sectional area is 0.25 in2 . When the specimen is stretched to an engineering strain of 0.09, an 80 ksi engineering stress is found. (a) What were the load and the change in gauge length values that were used to calculate the engineering stress and strain, respectively? (b) What are values of the true stress and the true strain? (c) Consider the true strain at this value of true stress. What portion of it is elastic and thus recovered upon unloading, and what portion of it is plastic?

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic