Question

Help please!!!

A technician determined the thickness of zinc on a galvanized washer. He collected these data.
outer diameter of washer, mm =26.4
inner diameter of washer, mm =10.8
height of washer, mm=2.2
mass of washer before reaction, g= 8.473
mass of washer after reaction, g=7.957

Questions:
Calculate the volume in cubic mm of the zinc coating?

Calculate the total surface area, in square millimeters (mm^2), of the washer

Calculate the thickness, in millimeters, of the zinc coating.

Answer 1

2. take the washer as 2 cylinders, find the volume of the whole thing, then find the volume of the hole and subtract it form the whole thing.