Suppose water clusters containing up to 50 molecules. If we add 500 water molecules at 0c with 500 water molecules forming ice at 0c . (a) The heat flow would be from ice to water or water to ice. (b) Which thermodynamic property directed the heat flow for the above situation. (c) Justify the heat flow direction from Boltzmann entropy equation.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

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 =

Aseries circuit contains a 30 e resistor, a 20 resistor, and a 10 resistor. the power supply provides 100 v to the circuit the current in the 10 resistor, to two significant figures, is a.