34.30 mL will be The volume of the zinc beads
The principle is that a floating or sinking object, liquid will always be displaced and volume of displaced liquid is equal to the volume of object.
So, the volume of the solid object is calculated as the differences between the final and the initial cylinder readings.
Vsolid = ΔV = V2 – V1.
V1 is the volume of the liquid.
V2 is the sum of the volume of the liquid and the solid object
Notice that V2 is greater than V1
Here initial reading=V1 = 42.55 mL, final reading=V2 = 76.85 mL
The volume of the solid object is
Volume of zinc beads = 76.85 - 42.55 = 34.30 mL
This is because the volume of the liquid and the volume of the solid object are additive.
Learn more about liquid displacement here
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