Recent content by jrw

awesome thank you :D

Homework Statement Using the definition of gravity, derive the mass of the Earth Homework Equations I am unsure if this is simply a plug n chug problem and I am over thinking it or there is some way to use calculus to derive the mass from the gravity equation. The Attempt at a...

Oh I see thank you very much :)

I guess then I am confused on which density I should use. I am given only the density and radius, so I found the volume of the planet using the total radius, but then to find the mass I need density * volume right?

but how do I account for the density change?

I am trying to figure out a gravitational acceleration of a planetary surface with two parts; a core and shell, radius and densities for each are given. I am not sure which equation to use to get started, will I find the gravitational acceleration of the core and then the shell? I just am not...