Air is compressed in a piston-cylinder assembly from p1=
10lbf/in.2, t1 = 500or to afinal
volume of v2 = 1 ft3 in a processdescribed by
pv1.25 = constant. the mass of air is0.5lb. assuming
ideal gas behavior and neglecting kinetic andpotential energy
effects, determing the work and the heat transfer, each in btu,
using constant specific heats evaluated at500or and
ideal gas properties.

Water at 55c flows across a flat plate whose surface temperature is held constant at 95c. if the temperature gradient at the plate's surface for a given value of x is 18 c/mm, find a) local heat transfer coefficient. b) heat flux

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.

What are the major differences between injection molding and extrusion?