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## Homework Statement

A rock is suspended by a light string. When the rock is in air, the tension in the string is 35.7N . When the rock is totally immersed in water, the tension is 25.9N . When the rock is totally immersed in an unknown liquid, the tension is 19.6N .

## Homework Equations

Density = m/v

buoyant force (b.f.)= density(of fluid) * gravity * Volume(of the part that is immersed in the fluid)

## The Attempt at a Solution

Since we're given the tension (T) in the air, we can find the mass of the rock because T = mg in that case. Then after this I'm not sure where to go with it because since I don't know the volume of the rock I can't use the (b.f.) equation to help me at all. What am I missing?

Thanks