a rectangular piece of wood measures 4 cm by 6 cm by 8 cm and has a mass of 20 g . what is the density of the piece of wood ? will this float in water or not ?
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Answer:
Volume = (0.04 m) * (0.06 m)* (0.08 m) = 0.000192 m^3
Mass = 0.02 kg
Density = 0.02 kg / 0.000192 m^3 = 20000/192 kg/m^3
Density = 625/6 kg/m^3, about 104 kg/m^3
OR
Density = mass / volume
Volume = (4 cm)*(6 cm)*(8 cm) = 192 cm^3
Density = 20 gm / 192 cm^3 = 5/48 gm/cm^3, about 0.104 gm/cm^3
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