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.

Answer 1

Density is mass/volume

Answer 2

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

Answer 3

oh is the formula... thank you

Answer 4

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

Answer 5

You're welcome. :)

Answer 6

do i use significant figures?

Answer 7

That is typically a good idea.

Answer 8

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

Answer 9

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

Answer 10

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

Answer 11

The formula is the same; you would still divide.

Answer 12

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