Find the average density of a white dwarf star if it has a mass equal to that of the sun (2.0 *1030 kg) and a radius equal to that of the Earth (6.4 * 106 m).
A)9.0 *106 kg/m3
B)1.8 * 107 kg/m3
C)1.8 *109 kg/m3
D)3.6 * 1010 kg/m3
E)9.0 * 107 kg/m3

Question

Quizplus · Accepted Answer

The volume of the white dwarf is calculated using the formula for the volume of a sphere, V = 4/3 * π * r^3. Substituting the radius of the Earth, the volume is approximately 1.1 * 10^21 m^3. The density is then mass/volume, which gives 2.0 * 10^30 kg / 1.1 * 10^21 m^3 = 1.8 * 10^9 kg/m^3.

Find the Average Density of a White Dwarf Star If