A star is estimated to have a mass of 3x10^36 kg. Assuming it to be a sphere with an average radius of 7.5x10^5 km, calculate the average density of the star in units of grams per cubic centimeter.

Question

A star is estimated to have a mass of 3x10^36 kg. Assuming it to be a sphere with an average radius of 7.5x10^5  km, calculate the average density of the star in units of grams per cubic centimeter.

joannablackwelder · Answer

Density is mass/volume

joannablackwelder · Answer

Volume of a sphere is 4/3*pi*r^3

anonymous · Answer

oh is the formula... thank you

joannablackwelder · Answer

Make sure to convert into the units it asks for too.

joannablackwelder · Answer

You're welcome. :)

anonymous · Answer

do i use significant figures?

joannablackwelder · Answer

That is typically a good idea.

anonymous · Answer

okay i have 1.767145868x10^18 how do you convert that to g/cm^3

joannablackwelder · Answer

I would convert kg to g and km to cm first.

anonymous · Answer

okay them i would add them together after the conversion or divde

joannablackwelder · Answer

The formula is the same; you would still divide.

joannablackwelder · Answer

Mass (in g)/ Volume (in cm^3)