Find the radius of an aluminum cylinder that is 2.00 cm long and has a mass of 12.4 g.

V = pi * r^2 * l

Aluminium cylinder: m = 12.4 g, L = 2.00 cm.

V = π r² L

Density of the aluminium: 2.7 g / cm³

V = 12.4 g : 2.7 g/cm³ ≈ 5 cm³

5 = 3.14 · r² · 2

r² = 5 : 6.28

r² = 0.796

r = √0.796

r = 0.9 cm

Answer:

The radius of an aluminium cylinder is 0.9 cm.

Your answer will be to your question will be: the radius is 4m