A steel tape with a cross sectional area of 0.04 cm2 and weighing 1 kg has a length of 30.01 m between the zero and the 30m marks, when supported throughout at 22 degree C and subject to a tension of 6 kg. This tape is used to measure a distance along a horizontal ground and is supported throughout during the measurement. The tension applied is 13 kg. The temperature of the tape is 6 degree C. The measured slope distance is recorded as 370m. What is the corrected horizontal distance? (Use K = 1.15 Times 10^-5/degree C per m and E = 2.1 Times 10^6 kg/cm^2)

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.