Question

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Answer 1

Explanation:

refer the attachment

hope it helps youu..

Answer 2

Answer:

The volume of iron ball is 40 cm³.

Explanation:

We have given the mass and density of an iron ball.

We have to find the volume of the iron ball.

We know that,

$\pink{\sf\:Density\:=\:\dfrac{Mass}{Volume}}\sf\:\:\:-\:-\:-\:[\:Formula\:]\\\\\implies\sf\:7.8\:g\:cm^{-\:3}\:=\:\frac{312}{Volume}\\\\\implies\sf\:Volume\:=\:\frac{312}{7.8}\\\\\implies\sf\:Volume\:=\:\cancel{\frac{3120}{78}}\\\\\implies\sf\:Volume\:=\:\cancel{\frac{1560}{39}}\\\\\implies\sf\:Volume\:=\:\frac{\cancel{120}}{\cancel3}\\\\\implies\boxed{\red{\sf\:Volume\:of\:iron\:ball\:=\:40\:cm^{3}}}$

Additional Information:

1. Volume:

The space occupied by an object is called its volume.

The SI unit of volume is m³.

The CGS unit of volume is cm³.

2. Mass:

The amount of matter in an object is called its mass.

The SI unit of mass is kilogram ( kg ).

The CGS unit of mass is gram ( g ).

3. Density:

The ratio of mass and volume of an object is called density of the object.

The SI unit of density is kg / m³.

The CGS unit of density is g / cm³.

4. Formula for density:

$\boxed{\red{\sf\:Density\:=\:\frac{Mass}{Volume}}}$