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March 4, 2015

March 4, 2015

Posted by **Mandy** on Friday, March 18, 2011 at 1:54pm.

- Physics -
**bobpursley**, Friday, March 18, 2011 at 4:19pmdo it this way.

you know g for a solid earth.

Now find g for a solid sphere of Earth the size of the bubble, 1.20km away.

Then, find g for a sphere of oil the size of the bubble, 1.20km away.

you have three numbers:

Take the first, subtract the second, and add the third. That is the resultant g value.

Remember in working these fictional bubbles, the mass is volume*density.

g'=GM'/distance^2 where M' is the mass of the bubble (Earth, then oil).

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