Numerical problem III — task. Science State Board, Class 7.

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Two spheres of same size are made from copper and iron respectively. Find the ratio between their masses. Density of copper

$8,900$

$kg/m^3$ and iron

$7,800$

$kg/m^3$ .

[NOTE: Enter the answer up to two decimal places.]

Density of copper and iron is denoted as

$D_c$ and

$D_i$ , respectively.

Ratio of masses of copper (

$M_c$ ) and iron (

$M_i$ ):

The formula for density is

From the above formula, the mass of an object is

$\begin{array}{l} Mass = i \times i \\ = i i \times i i \end{array}$

The ratio of masses of copper (

$M_c$ ) and iron (

$M_i$ ) is

$i : i$ .

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24. Numerical problem III