Consider a hypothetical x+y− ion pair for which the equilibrium interionic spacing and bonding energy values are 0.38 nm and –5.37 ev, respectively. if it is known that n in equation 2.17 has a value of 8, using the results of problem 2.18, determine explicit expressions for attractive and repulsive energies ea and er of equations 2.9 and 2.11.
en = -a/r + b/(r^n)
calculate the bonding energy eo in terms of the parameters a, b and n.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false