Explain whether the benefits outweigh the weaknesses of the dam described in the following scenario and provide an argument in favor of or against the project. Situation: Farmers in a small South American country have to cope with the spring Amazon River floods. They would like the government to build a dam that would control flooding and provide hydroelectricity. However, they are concerned about the effects it would have on the ecosystem, possibly causing severe erosion and impacting species survival.

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.