The top-down method of estimating project time and costs that is useful for projects requiring the same task, group of tasks, or product repeated several times, especially if it is labor intensive, is the . a) function point
b) ratio
c) apportion
d) consensus
e) learning curves

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?