Question

what will be the mass of a metal sphere of radius 3.0 cm of its density is 7g/cm cube​

Answer 1

Answer:

792 g

Explanation:

According to the given question,

r = radius = 3 cm

d = density = 7 g/cm^3

V = volume and m = mass

And we are asked to find the mass of the metal sphere.

We know,

• Density = mass/Volume

• Mass = Volume×density

• m = 4/3 × π × r^3 × d

Putting the values we get,

• m = 4/3 × 22/7 × 27 × 7

• m = (4×22×27×7)/(3×7)

• m = 4×22×9

• m = 792 g

Thus mass of the metal sphere is 0.792 kg or 792 g .

Answer 2

density = 7.0 g/cm³ or 7 g/cm³

radius = 3.0 cm or 3 cm

mass = 4/3pir³d

= 4/3 × 22/7 × 3 × 3 × 3 × 7

= 4 × 22 × 3 × 3

= 792 g

1 kg = 1000 g

792 g = ( 792 × 1000 ) kg

= 0.792 kg

Hope it helps you!!