Asingle-threaded 25 mm diameter power screw has a pitch of 5 mm. the vertical load on the screw reaches 5 kn. the coefficients of friction are 0.08 for the collar and 0.10 for the threads. the collar frictional diameter is 50 mm. find the overall efficiency and the torque required to raise and lower the load.

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.