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As it is known the density is given by d=m/V where m is the mass and...

As it is known the density is given by d=m/V where m is the mass and v is the volume of the material..

A)Consider that our planet has a perfect sphere shape, find the mean density of our planet in the unit of  g/cm3

B)As it is know that the sun in our universe will reach its end after a few billion years. Assuming the mass of the sun will remain same (1.9891*10^30 kg) calculate the density if the sun's diamater is 15,000 kmkm after a few billion years?

C)A star has the similar mass with our sun and the diameter of this star is 22 km . Find the denisty of the star with the unit of g/cm3

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