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## Homework Statement

A cylindrical tank of internal diameter 1.5m and length 2.0m is mounted on a trailer. When the tank is filled with water the combined weight is 55 kN. Find the weight of tank plus trailer with the tank full of methyl alcohol (relative density 0.789).

## Homework Equations

density*volume=mass

pi*r²*length= volume of cylindre

## The Attempt at a Solution

total volume of methyl in tank= 3.53 m³

using density of methyl (789 kg/m³)

mass of methyl in tank= 2788.55 kg

however, I don't see how this is gonna help finding the mass of water in the tank filled with water or the mass of the tank. Basically, if I don't find the volume of water in the tank filled but not fully with water I cannot find the mass of that water. Therefore, I cannot find the mass of the tank and trailer.

if anybody could help that would be nice.

thanks.

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