Jawaban:

1.

massa jenis air

ρ = 1 g/cm³

ρ = m/V

Benda 1

ρ1 = 3,4/1,5 = 2,267

ρ1 > ρ maka tenggelam

Benda 2

ρ2 = 2,1/6 = 0,35

ρ2 < ρ maka terapung

Benda 3

ρ3 = 5/5 = 1

ρ3 = ρ maka melayang

2.

Usaha W sama

Benda A

s = 600 m

Benda B

Fb = 6 Fa

s = ?

W = F s

Wa = Wb

Fa sa = Fb sb

Fa 600 = 6Fa sb

600/6 = sb

sb = 100 m

3.

90 getaran = 1 menit = 60 detik

1 getaran = 60/90 = 0,66 detik

T = 0,66 detik

f = 1/T = 1/0,66 = 1,5 Hz

A = 8 cm

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