Question

the radius of metalic sphere is 4.9cm. if the density of metal is 7.8g\cm3. find the mass of sphere.

Answer 1

radius of sphere, r = 4.9 cm

Volume = 4/3 πr^3

=> V = 4/3 × 22/7 × (4.9)^3 cm^3

=> V = 4/3 × 22 × 0.7 × 4.9^2 cm^3

=> V = 493 cm^3

Volume of sphere = 493 cm^3

density = 7.8 g/cm^3


mass = density × volume

=> mass = 7.8 × 493 = 3845.4 g

Mass of sphere is 3845.4 gram.

Answer 2

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$\huge{\bold{\mathfrak{Here\:is \:ur\:Answer}}}$

♏Given:-

•Radius of metallic sphere = 4.9 cm

•Density Of metal = 7.8 g/cm^3

♏As we know that ,

$\boxed { \sf{volume \:of\: sphere\: =\:4/3πr^3}}$

So,

=>$\sf{Volume\: of\: metallic\: sphere = 4/3×22/7×4.9×4.9×4.9}$

$<b>=>Mass of a material = density of that material ×Volume of that material</b>$

=>Mass of the metallic sphere = 7.8×(4/3)×22/7×4.9×4.9×4.9 cm^3=3845.44 gm=3.845 kg

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•$<b>Hence the mass of the metallic sphere is 3.845 kg</b>$

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$\huge{\bold{Thanks}}$✌️