Initially a cable is 20 meters long. The cable is stretched to a length of 20.1 m. The length of the cable is held constant. The material can be modeled using a Maxwell model with an elastic modulus of 2 GPa and a viscosity coefficient of 500 TPa. sec. (30 points) a) Sketch the problem
b) Sketch the Maxwell model
c) Estimate the stress in the cable immediately after stretching
d) Estimate the stress in the cable 24 hours after stretching
e) Estimate the stress in the cable 7 days after stretching
f) Sketch the stress-time curve in the cable

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.