7 .E3 MassBulk = 107,833m 2 ((7870) (t) Kg/m 2 J = (8.486xl0 8 ) (t) Kg To determine the bulkhead area density, simply divide this mass by the total area of the inner and outer hulls. Area. inner Area o u t e r l.888xl0 5 m 2 2 (rr) (105) (100) + 4 (rr) (105) 2 2.045xl0 5 m 2 :~:: (2158) (t) Kg/m 2 Note the c 1 , c 2 , etc., are measured on the inner hull. This assumption was used to mitigate somewhat the overly conservative assumptions of Sections VII.4.3 and VII.4.4 where the bulkheads were considered equal in thickness to the hull plate. Any final design of the hull would, of course, be more rigorous in its assumptions of component weights. The total mass of the agricultural system is estimated at l.94xlo 7 Kg. This mass is broken down as follows: Soil - l.92xl0 7 Kg Polyethylene - l.53xl0 4 Kg (for insulation and tubing) (plant and animal consumption) water Plants Animals - 3.5xl0 4 Kg - 9.6xl0 4 Kg - 6.15xl0 4 Kg The agriculture mass is spread over the cylindrical portion of the inner hull and thus has an effective area density of: l.94xl0 7 Kg = 308_9 Kg/m2 2 (100) rr (100)m 2 NOTE: At the time this analysis was performed, agricultural soil depth was not well defined. For this analysis, it was set at 16 cm over the entire cylindrical area with some allowance for pathways between fields. Density was taken as 2000 Kg/m 3 (moonsoil). Later work set the depth at 30 cm (see Section VI.11.6).
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