Which of the following statements describes a potential problem associated with indirect headlines in print ads? multiple choice they generate curiosity in readers, which takes attention away from the message. they may not be provocative enough to direct a reader's attention to the rest of the message. they avoid the use of questions or provocations. they avoid the use of how-to statements. they are often treated as subheads.

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.