A Ge-Ga crystal is grown by normal freezing. Initial melt composition is 10 ppm Ga. Growth rate is 8 x 10^(-3) cm/s. (a) If convection is completely absent, what thermal gradient is required to maintain a plane front when the ingot is 50 percent solidified? (b) If convection is sufficiently vigorous that K^' ≅ K, what thermal gradient is required to maintain a plane front when the ingot is 50 percent solidified? (c) If 0 = 0.005 cm, what thermal gradient is required to maintain a plane front when the ingot is 50 percent solidified?

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

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.