Checkpoint: density

A rock has mass 120 g and volume 40 cm³. What is its density?

• 3 g/cm³
• 0.33 g/cm³
• 80 g/cm³

Water is 1 g/cm³. A light oil is 0.8 g/cm³. A block of 0.9 g/cm³ goes into each. What happens?

• It floats in both
• It floats in water and sinks in the oil
• It sinks in both

A block of mass 60 g has volume 40 cm³. What does it do in water?

• It hangs in the middle
• It floats
• It sinks