The density of paper is 800 kg m-3. A typical sheet of paper has a width of 210 mm and a length of 300 mm.

Question 31

The density of paper is 800 kg m^-3. A typical sheet of paper has a width of 210 mm and a length of 300 mm.

The thickness of a pack of 500 sheets of paper is 50 mm.

What is the mass of a single sheet of paper?

A 0.5 g                        B 5 g                           C 50 g                         D 500 g

Reference: Past Exam Paper – March 2018 Paper 12 Q4

Solution:

Answer: B.

Thickness of 500 sheets = 50 mm

Thickness of 1 sheet = 50 / 500 = 0.10 mm

Width = 210 mm

Length = 300 mm

Volume of 1 sheet = 0.1 × 210 × 300

Volume of 1 sheet = 6300 mm³ = 6300×10^-9 m³

Density = mass / volume

Mass = Density × volume

Mass = 800 × 6300×10^-9

Mass = 0.00504 kg = 5.04 g