White dwarf density, free fall acceleration, and potential energy

[aliciagu]

I am in deperate need of help! Physics

The question:
after our sun exhausts its nuclear fuel, its ulitmate fate may be to collapse to a white dwarf state, in which it has approximately the same mass as it has now but a radius equal to the radius of the earth. Calculate: The average density of the white dwarf; the free fall acceleration; the gravitational potential energy associated with a 1.00-kg object on its surface.

I don't even know where to start. I'm lost. PLEASE HELP!

 

[Hootenanny]

I don't even know where to start. I'm lost. PLEASE HELP!

Read your class notes and look up the mass of the sun and the radius of the earth.

 

[aliciagu]

Thanks! That got me started. I don't know where my head is at today! I think I've got the rest.