Deriving the formula for tidal generating force TGF

[HenryM]

i have been asked to show that the TGF acting on a 1kg mass, on the surface of the Moon is equal to:

TGF = 2g.e^2.(a/r^3)

Where;
g = 9.81
e = radius of the Earth
a = radius of the Moon
r = distance between the centres of the Earth and Moon.

 

[BvU]

Hello Henry,

Have you, now ? And what are you going to do to show it ?
Please rea the PF guidelines to understand why we can't help you (yet)

 

[HenryM]

well, i need to derive it from Newtons law for gravitiation.. i think. i can do it conserving the mass elements, but I am not sure how to remove them.

Thanks

 

[BvU]

I suppose you are supposed to assume the densities of Earth and moon are the same (they are not) .
Start your derivation and post your work.

Please read the PF guidelines

 

[jim mcnamara]

This seems to be homework. PLEASE use the homework template and post in the homework forum. Thanks.

Since this already has dialog, we will let it go, template-wise. Moving to homework...