Question

A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?

(A) 30cm^3

(B) 20cm^3

(C) 10cm^3

(D) 2cm^3

Answer 1

According to an Archimedes' principle if a piece of plastic barely floats in the water, its volume is equal to volume of water with mass $20\mathrm{g} - 20\mathrm{cm}^3$

Answer: "B"