Part.1 Complete 3 of the 5 HW-style problems that follow (12 points): 1. (4 points) In a gear system, segments (1) and (2) are both solid 1- inch-diameter. Motor rotation speed is 100 Hz. Allowable shear stress for each shaft is 8700 PSI. Calculate (a) The rotation speed of gear E (in Hz). (b) The allowable torque TE at gear E. (c) The maximum power that can be transmitted by the gear train (No FBD required)

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.