A young engineer wishes to become a millionaire by the time he is 60 years old. She belives that by careful investment he can obtain a 15% rate of return. She plans to add a uniform sume of money to his investment program each year, beginning on his 20th birthday and continuing through his 59th birthday. How much money must the enigneer set aside in this project each year?

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.