Calculating mass of inner core in Kg when i only have the density

[flower123]

Homework Statement

SO i don't have the radius or the volume but i have an estimate of the density 14.5 10³kg m-3
Im really uncertain of the formula needed to A. get the radius without the volume and vice versa. PLEASE HELP! Thanks in advance!

Homework Equations

The Attempt at a Solution

 

[Borek]

If density estimate is all you have, I can't think of anything. But perhaps that's not the whole question/problem?

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[flower123]

what else would i need? Radius? The radius is 1221km sorry for the rush in my posting and leaving out the rather important bits!

 

[mgb_phys]

And the total mass, or the density of the none core part, or the overall average density.

 

[flower123]

the question reads...

using the information calculate the mass of the Earth's core in Kg applying the equation mass= density x volume.

show all working and and include units. give answer in appropriate scientific notation and to an appropraite significant figures.

So i have used the graph provided to get the value of density for the inner core.14.5 10³kg m-3 and the radius of 1221km. SO to calculate the volume of a sphere using these values.

 

[Borek]

So where is the problem? You have density and radius, you don't need anything else.

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