Calculate Weight of "Weightless" Ichthyosaurus in Metric Tonnes

[robertsa]

Homework Statement

Fossilized ichthyosaurus remains enable us to estimate their volume. If we assume that a
3m^3 icthyosaurus was "wightless" when it swam under water. What was its weight in metric tonnes?

Homework Equations

B=Wdisp. lqd ??

The Attempt at a Solution

B=V x density x g
g=9.81
density= 1000 kg/m^3 (assuming fresh water)
V=3m^3

plugging this into the equation would give me B .. not weight??

 

[rl.bhat]

Weightless means
mg = weight of the displaced liquid.