For an engineering application, a plate of a titanium alloy (ti-6a1-4v) with a rectangular cross-section, and a length of 2 m will be subjected to a tensile force of 55 mn. the facture toughness of this alloy is 55 mpaym, the modulus of elasticity is 114 gpa and the yield strength is 910 mpa. a) determine the cross-sectional dimensions of the rectangular plate at the point at which yielding initiates. the ratio of the two sides of the rectangular cross-section is 1: 5. [3 marks] b) at the point at which yielding initiates, given that the deformation is entirely elastic up until this point, what will be the resultant elongation of the plate? [2 marks] c) calculate the size of an interior crack that will lead to catastrophic failure at an applied stress of 50% of its yield strength.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol