Answer: The crown is not made of pure gold.
Explanation:
Archimedes discovered that any solid, of any shape, when submerged in a liquid receives an upward force, equal to the weight of the volume of the liquid removed by the solid, which is equal to the solid volume.
So, if any body is weighed in air, the normal force will be equal to the gravity force (which we call weight) which can be expressed as follows:
Fg = m g = δ V g = 34.7 N
When submerged in water, the normal force is equal to the difference between the actual weight, and the upward force due to Archimedes' principle, called buoyant force, as follows:
Fn = Fg - Ep = δx. V. g - δH20 . V. g = 31.5 N
Dividing Fg between Fn, and simplifying common terms, we have:
δx / (δx - δh20) = 34.7 / 31.5 = 1.10
Solving for δx, we get the following value:
δx = 11,000 Kg/m3, less dense than pure gold, so we can conclude that the crown was not made of pure gold.
