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Răspuns :

P = F/S → F = S • P

P = 245kPa = 245000Pa

r=80cm = 0,8m

S= π r² = 3,14 • (0,8m)² = 3,14•0,64m² = 2 m²

F = 2 m² • 245000 Pa = 490.000 N