In a 3x3m square flat horizontal solar collector the outside of the glass cover of the collector is at 40 c and the ambient air is at 10 c with wind parallel to the surface of the collector at velocity of 10m/s. find: a. the rate of heat loss by convection from the glass b. the friction coefficient, cf on the glass c. if the wind dies down find the rate of heat transfer from the glass assuming its outside temperature remains the same.

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

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.

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