A solid rock,suspended in air by a spring scale,has a measured mass of 8.50 kg.When the rock is submerged in water,the scale reads 4.00 kg.What is the density of the rock? (water density = 1 000 kg/m³) A)6.8E+2 kg/m³ B)8.9E+2 kg/m³ C)3.2E+2 kg/m³ D)1.9E+3 kg/m³ E)1.9E+6 kg/m³

Question

Quizplus · Accepted Answer

The buoyant force equals the weight of the water displaced, which is 8.50 kg - 4.00 kg = 4.50 kg. The volume of the rock is the volume of water displaced, which is 4.50 kg / 1000 kg/m³ = 0.0045 m³. The density of the rock is mass/volume = 8.50 kg / 0.0045 m³ = 1.9E+3 kg/m³.

A Solid Rock,suspended in Air by a Spring Scale,has a Measured