February 7, 2018 Seatwork #2 1. A drum 6 inches in diameter and 40 inches long contained acetylene at 250 psia and 80°F. After some of the acetylene was used the pressure was 200 psia and the temperature was 70°F (a) what portion of the acetylene was used, and (b) what volume would the used acetylene occupy at 14.7 psia and 60°F. 2. It is planned to lift and move logs from almost inaccessible forest areas by means of balloons. Helium at atmospheric pressure (1010.325 kPa) and temperature 21.1°C is to be used in the balloons. What minimum balloon diameter (assume spherical shape) will be required for a gross lifting force of 20 metric tons? 144%