A block of wood has dimensions of 1.2 m × 5.0 cm × 7.0 cm and has a mass of 3.0 kg. What is the density of the wood?
A) 1400 g/mL
B) 0.071 g/mL
C) 0.71 g/mL
D) 1.4 g/mL
E) 140 g/mL

Question

Quizplus · Accepted Answer

First convert the dimensions to meters: 1.2 m × 0.05 m × 0.07 m = 0.0042 m^3.
The density is defined as mass per unit volume. Therefore, density = mass/volume.
density = 3.0 kg/0.0042 m^3 = 714.3 kg/m^3 = 0.71 g/mL. 
Therefore the correct answer is C.

A Block of Wood Has Dimensions of 1