Suppose Canada can make either 1000 units of timber or 800 heads of cattle and the US can make either 1000 head of cattle or 900 units of timber assuming the same amount of resources are used how should each specialize

Acircular pipe of 30mm outside diameter is placed in an airstream at 30 c and latm pressure. the air moves in cross flow over the pipe at 20 m/s, while the outer surface of the pipe is maintained at 110 c. what is the drag force exerted on the pipe per unit length? what is the rate of heat transfer from the pipe per unit length?