average cable length In this interval is 586 feet, the elongation of the cable is 

 0.04 X 586 = 23.4 feet. The restoring -force constant was determined to be 145 pounds 

 per foot (i.e., 3,400/23.4). The virtual mass of the cable assembly was found to be 

 11,350 pounds; i.e., M^ = (T2/4^)g = [(9.8)2 (145)/42] 32.2. Of this 11,350 pounds, 

 950 pounds is due to the static weight of the suspended cable. The net weight of the 

 STU in water is 5,500 pounds. Thus the added mass coefficient, C^, is determined 

 to be slightly less than 2.0 (i.e., 10,700/5,500). 



7b 



