Trace the backtracking + unit propagation + atmost algorithm for finding an answer set of the program p(a) : - not p(b). p(b) : - not p(a). q(a). : q(b) : - p(x); not r(x). note that the signature of the program above contains only two constants: a and b. remember to ground the program before applying the search algorithm.

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?