Hi all, I'm just looking a little direction here, not the answer, so if anyone can help, that would be great.

In a current assignment I have, I need "to obtain an expression for ga in terms of Newtons' universal gravitational constant G, the radius of te asteroid Ra and the density of the rock. And hence, determine Ra. (The volume of a sphere of radius R = 4/3*Pi*R^3)."

We are given the density of the rock, and told that an experiment was done on the asteroid which shows it takes a small object 4.20 seconds to fall 1 metre.

If anyone can point me in the right direction, that would be great! I think I have a mental block on this one, I just can't seem to find my way.

Cheers

Sean

PS - I put this in the wrong section, I meant to put it in the College section. Sorry.

In a current assignment I have, I need "to obtain an expression for ga in terms of Newtons' universal gravitational constant G, the radius of te asteroid Ra and the density of the rock. And hence, determine Ra. (The volume of a sphere of radius R = 4/3*Pi*R^3)."

We are given the density of the rock, and told that an experiment was done on the asteroid which shows it takes a small object 4.20 seconds to fall 1 metre.

If anyone can point me in the right direction, that would be great! I think I have a mental block on this one, I just can't seem to find my way.

Cheers

Sean

PS - I put this in the wrong section, I meant to put it in the College section. Sorry.

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