Odpowiedzi

2010-04-15T17:58:33+02:00
P = F/S

m = 90kg
g = 10m/s²

F = m*g = 90kg*10m/s² = 900N
S = 2*1500cm² = 3000cm² = 0,3m²

1m² = 10 000 cm²

p = 900N/0,3m² = 3000 Pa = 3 kPa
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