Hey guys, I'm looking for a hand on this problem I've got to solve. It's basic thermo stuff involving balancing some forces but my attempts to solve this have been futile thus far...

A 10000kg empty tank is put into the ocean with an open top.

Cross sectional area is 3m squared. It is 16m high.

the tank must ink 10m and float there.

To make the tank sink 10m, we will pour concrete into it.

How much concrete must we pour?

It was suggested to balance the tank so it floats on top of the water as state 1, then state 2 will be 10m under the ocean's surface. I feel like I'd need the density of water to solve this and as I go deeper with the tank, the upwards force of the water on the tank will increase exponentially. Problem with this is, we're not that advanced in this class and there MUST be a simpler solution.

Any tips?

Thanks in advance.

-Ry

Ry_Snow@hotmail.com