Odpowiedzi

2010-03-23T16:51:58+01:00
Zakładam, że drabina ma dwie nogi
S = 6 cm^2 *2 = 12 cm^2 = 0,0012 m^2 ; (^= do kwadratu)
bo 1m = 100 cm a 1 m^2 = 100cm *100 cm = 10000 cm^2
m = 15 kg+84 kg = 99 kg
F = m*g
F = 99 kg*10 N/kg = 990 N
p = ?
p = F/S
p = 990 N/0,0012 m^2
p = 825 000 N/m^2 = 825000 Pa = 825 kPa (kilopaskali)
3 5 3