Interaction for Graded Question: attractive Interaction coefficient, k: 0.42 N*m^-4 Interaction strength, n: 4 Mass of less massive particle: 0.0035 kg Time step (deltat): 5e-6 s Initial Conditions Initial position of the more massive particle (remains still): <5,4,0> m Initial velocity of the more massive particle (remains still): <0,0,0> m/s Initial position of the less massive particle (will interact): <-3.9, -1.3, 0> m Initial velocity of the less massive particle (will interact): <610, 650, 0> m/s Keep the more massive particle fixed. Model the motion until 2.800 s have passed.

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.