Answer 5A_5_3

Find the volume:

V = 4/3pr³.

V for Earth = 4/3 x p x (6.4 x 10⁶ m)³ = 1.10 x 10²¹ m³

Density = mass/volume = 6.0 x 10²⁴ kg ÷ 1.10 x 10²¹ m³ = 5500 kg m^-3.

For the Sun:

V = 4/3 x p x (7.0 x 10⁸ m)³ = 1.44 x 10²⁷ m³

Density = mass/volume = 2.0 x 10³⁰ kg ÷ 1.44 x 10²⁷ m³ = 1400 kg m^-3.

For the white dwarf:

Density = mass/volume = 2.0 x 10³⁰ kg ÷ 1.10 x 10²¹ m³ = 1.8 x 10⁹ kg m^-3.

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