Write a constructor , height, width) that constructs a new board object by initializing the following three attributes: an attribute height that stores the number of rows in the board, as specified by the parameter height an attribute width that stores the number of columns in the board, as specified by the parameter width an attribute slots that stores a reference to a two-dimensional list with height rows and width columns that will be used to store the current contents of the board. each slot will contain one of the following characters:

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.