The L=1m long vertical copper tube of inner diameter Di=20mm and wall thickness t=2mm contains liquid water at T(water)=0 degrees celcius. On a winter day, air at v=3m/s and T= -20 degrees celcius is in cross flow over the tube. a)determine the heat loss per unit mass from the water (W/Kg) when the tube is full of water.\ b)determine the heat loss from the water (W/Kg) when the tube is half full.