Answer to Question 4

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Find the volume:

V = 4/3pr3.

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

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

 

For the Sun:

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

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

 

For the white dwarf:

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