Question

Radius of an iron sphere is 0.21 cm . if density of iron is 7g / cm³, calculate its mass

Answer 1

Answer:

mass of iron sphere nearly equal to = 0.273 g

Explanation:

radius of iron sphere , r = 0.21 cm

density of iron sphere , d =7 g /cm^3

mass of iron sphere , m = ?

volume of iron sphere ,v = 4/3 * (phi) *(r^3)

=4/3 * 22/7 * (0.21)^3 = 0.039 cm ^3

mass of sphere = v*d

= 7 * 0.039 = 0.273 g

Answer 2

Answer:

0.273 grams

Explanation:

Given :

• Radius of the iron sphere = 0.21 cm

• Density of the iron = 7 g/cm³

To find:

• Mass of the sphere

Volume of a sphere = 4/3×pi×r³

Volume of the sphere = 4/3×22/7×21/10×21/10× 21/10

Volume of sphere = 0.039 cm³

Density = Mass/volume

7 g/cm ³ = mass/0.039

Mass = 7×0.039

Mass = 0.273 grams

The mass of the iron sphere is equal to 0.273 grams