Alisha is conducting a paired differences test for a "before (b score) and after (a score)" situation. she is interested in testing whether the average of the "before" scores is higher than that of the "after" scores. (a) to use a right-tailed test, how should alisha construct the differences between the "before" and "after" scores?

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.