Element z has a half-life of 20 minutes. in an events chain concept map tracing the nuclear decay of a 200g sample of element z, would any of element z remain after 160 minutes? if so, how much?

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

70 give a real life example showing how sensory neurons work with the motor neurons

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =