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.

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

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