6. A Mk-83 laser guided bomb is being used to attack an SA-6 mobile SAM site. The Mk-83 warhead casing weight is 250 kg and is "scored" to produce 10,000 fragments. The SAM site can withstand at least 10,000 Joules of energy before fragment penetration. What fragment velocity is required to achieve fragment penetration against the SA-6 mobile target?

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.