Anotched member has an elastic stress concentration of kt = 3.00 and is made of a material and has an elastic, perfectly plastic stress-strain curve with e = 200 gpa and oys = 400 mpa. the member is loaded from zero to a nominal stress s, and then unloaded. a) determine the residual stress and strain after removal of s, for (i) s=250 mpa, and (b) si= - 250 mpa.

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Fluids at rest possess no flow energy. a)- true b)- false

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.