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#24
ρ = 0,8 g/cm3
= 0,0008 kg / 0,000001 m3
= 800 kg/m3
h = 40 cm = 0,4 m
g = 10m/s2
Ph ?
Ph = ρ . g . h
= 800 . 10 . 0,4
= 3200 N/m2 ( D )
#25
D1 = 1
D2 = 40
A1 = D1^2
= 1^1 = 1
A2 = D2^2
= 40^2
= 1600
F2 = 32 000 N
F1 ?
A1 / A2 = F1 / F2
1 / 1600 = F1 / 32 000
F1 = 1/1600 . 32 000
= 20 N
#31
h = 85 - 40
= 45 cm
= 0,45 m
g = 10m/s
v ?
v = √(2gh)
= √(2 . 10 . 45 )
= √ 900
= 30 m/s^-1 ( D )