A single crystal of a BCC metal is oriented so that the direction is parallel to the applied stress. The critical resolved shear stress required for slip is 80.98 . Calculate the magnitude of the applied stress required to cause slip to begin in the direction on the slip plane. (Express your answer to three significant figures. If no shear stress is resolved, enter UNDEF.)

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.