Astructural steel sample (k = 80.2 w/m k and α = 3.31 x 10-5 m2/s) undergoes heat treatment at 600c. the sample is 20 cm thick and when removed from the furnace is exposed to air at 22 °c with a convection coefficient of 240 w/m2 k. a) find the surface temperature after 30 minutes.

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m