Write a function {position xs y} that returns the first position of y in the list xs. the positions in a list start with 1. for example, {position [a b c] c} returns 3 and {position [a b c b] b} returns 2. try two versions: 1) one that assumes that y is an element of xs and 2) one that returns 0, if y does not occur in xs

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?

Explain the strain-hardening phenomenon on the basis of dislocation - dislocation strain field interactions. also, briefly describe what generally happens to the ductility of a metal that has been strain hardened (i.e. does strain hardening make a metal more ductile or

What is the fuid acceleration in vector form for the following velocity field? note i, j, and k are unit vectors. show all of your work.