Design a fixture for the table saw that will accurately cut 90 degree miter joints. Your jig should incorporate a bottoming board to keep everything together, runners for the table grooves and some means to orient both side pieces of the joint for cutting. Include any safety features you deem necessary. You are producing an isometric sketch of your design. Im in 10th grade so please keep it simple.

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.