Buoyancy: a Rock Is Suspended from a Scale Reads 20

question 39

Multiple Choice

Buoyancy: A rock is suspended from a scale reads 20.0 N. A beaker of water (having a density of 1000 kg/m³) is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?

• A) 1.60 × 10³ kg/m³
• B) 2.50 × 10³ kg/m³
• C) 2.33 × 10³ kg/m³
• D) 3.00 × 10³ kg/m³
• E) 2.67 × 10³ kg/m³

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