The 5.4-kg ball and the attached light rod rotate in the vertical plane about the fixed axis at o. if the assembly is released from rest at θ = 0 and moves under the action of the 107-n force, which is maintained normal to the rod, determine the velocity v of the ball as θ approaches 90°. treat the ball as a particle.

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.