Jawaban:

1.

h air = 5 cm

ρ air = 1000 kg/m³ = 1 g/cm³

g = 10 m/s²

ρ minyak = 900 kg/m³ = 0,9 g/cm³

Δh = ?

Pair = Pminyak

ρgh = ρgh

1x10x5 = 0,9x10xh

h = 5,55 cm

Δh = = 5,55 - 5 = 0,55 cm

2.

V = 0,6 m³

Vf = 3/4 V = 3/4 x 0,6 = 0,45 m³ (yg tercelup)

ρ air = 1000 kg/m³ = 1 g/cm³

g = 10 m/s²

a. Fa = ?

Fa = ρ g Vf = 1000 x 10 x 0,45 = 4500 N

b. ρ = ?

Fa = W

Fa = mg = ρ V g

4500 = ρ x 0,6 x 10

ρ = 750 kg/m³

3.

Vf = 2,5x0,5x0,4 = 0,5 m³

ρ air = 1000 kg/m³ = 1 g/cm³

g = 10 m/s²

Fa = ?

Fa = ρ g Vf = 1000 x 10 x 0,5 = 5000 N

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