A city is evaluating a proposal to build a parking lot. Data on the number of parked cars per day was collected for 30 days. For the proposal to be approved the city council needs to have evidence that the average number of cars parked in parking lots per day is more than 570. From the sample, the average number of cars parked per day was calculated to be 590.33 with a standard deviation of 52.062. A statistical analysis is done based on the collected data. Use this information to answer questions 1-8.

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.