Density – Step-by-Step Numerical Problems (Class 8 Physics)

Title : Density Numerical Problems with Step-by-Step Solution / Class 8 Physics –
Part 2




Question: 5

A piece of zinc of mass 438.6 g has a volume of 86 cm³ . Calculate the density of zinc.


Solution:

Given:

Mass of Zinc = 438.6 g

Volume of Zinc = 86 cm³

Density of Zinc = ?

Formula:

Density = Mass / Volume

Substitution:

Density = 438.6 g/86 cm³
= 5.1 g/cm³
D = 5.1 g/cm³

Final Answer: D = 5.1 gcm⁻³

, Question: 6

A piece of wood of mass 150 g has a volume of 200 cm³. Find the density of wood in

(a) CGS unit (b) S.I unit

Solution:

Given:

Mass of wood - 150 g

Volume of wood = 200 cm³

(a) CGS unit

Formula:

Density = Mass / Volume

Substitution:

= 150 g/200 cm³
= 0.75 g/cm³
Final Answer (CGS) : 0.75 g/cm³


(b) S.I. unit

Convert mass into kg

1 g = 0.001 kg
Mass 150 g = 0.150 kg

Convert volume into m³