Question Detail
Question
A solid material of uniform cross-section has a radius of 0.3 cm. If its length is 4 cm and mass 8 g, find its density in g/cm³.
Correct Answer
Option B is the correct answer.
Detailed Explanation
Volume = cross-sectional area × length = πr² × L = π × (0.3)² × 4 = π × 0.09 × 4 = 0.36π ≈ 1.131 cm³. Density = mass/volume = 8 / 1.131 ≈ 7.07 g/cm³.
Hint
Density = mass/volume. Volume for cylinder = πr²h.