Calculating mass

[moonflower]

SO i dont 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!

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some how must use the values above to get my answer?!

[Cap'n Refsmmat]

If you have the density but no volume or radius, there's no way to determine the size or mass.

 

Do you have any other additional information?

[Iggy]

SO i dont have the radius or the volume but i have an estimate of the density 14.5 10³kg m-3

Earth's inner core?

[Radical Edward]

SO i dont 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!

---

Merged post follows:

Consecutive posts merged

some how must use the values above to get my answer?!

 

you need some spatial information. Density = mass/volume - you need two of those to work out the third.

[the tree]

you need some spatial information. Density = mass/volume - you need two of those to work out the third.

Or some behavioural characteristic that you can derive those from. Buoyancy, displacement, urm.. weight?

[Mr Skeptic]

With that you can find an element with that density and give the radius of the element's atoms? I doubt that is your answer. I think you need more information. What is the full question?

[Severian]

Presumably, in the question, or in the lectures, you were given the radius of the Earth's inner core (1,220km). You can use that to find the volume and then use the density to find the mass.

[khaled]

so we have, density 14.5 * 10³kg m³

 

and, Density = mass/volume

 

so, mass = density * volume ..and.. volume = mass / density

 

... mass = 14.5 * 10³ * volume ..&.. volume = mass / 14.5 * 10³

 

UNIT mass = 14.5 * 10³ * 1 kg ..for volume = 14.5 * 10³ m³

 

UNIT volume = 1 m³ / (14.5 * 10³) = 6.8965517241379310344827586206897e-5

UNIT volume (round) = 6.9

 

but the question is, how did you estimated the density in the first place,

 

.. what are you working on, explain your geometrical work space ...