Refrigerant 134a exits a heat exchanger through 0.75-in.- diameter tubing with a mass flow rate of 0.9 lb/s. The temperature and quality of the refrigerant are –158F and 0.05, respectively. Determine the velocity of the refrigerant, in m/s.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

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.