A rock is suspended from a scale reads 10.0 N. A beaker of water is raised up so the rock is totally submerged in the water. The scale now reads 6.25 N.What is the density of the rock?
A) 2.00 times the density of water
B) 2.33 times the density of water
C) 2.67 times the density of water
D) 3.00 times the density of water
E) 2.50 times the density of water

Question

Quizplus · Accepted Answer

The buoyant force is 10.0 N - 6.25 N = 3.75 N, which equals the weight of the water displaced. The weight of the rock is 10.0 N. The density of the rock is the weight of the rock divided by the buoyant force, which is 10.0 N / 3.75 N = 2.67 times the density of water.

A Rock Is Suspended from a Scale Reads 10