FILE No.195Unsolved
On a table are two eggs that look the same. One is raw, and one is boiled. You want to tell them apart without breaking the shell.
Which is the most reliable method?
If you get stuck, open the hints one at a time, in order.
How does an egg with solid contents differ from one with liquid contents when spun?
Both sink in water.
Inertia is the clue.
Which is the most reliable method?
Choose the answer closest to the truth.
Spin it on the table and watch how it spins
The answer is "Spin it on the table and watch how it spins."
A boiled egg has solid contents, so it spins steadily for a long time. In a raw egg, the contents do not spin along with the shell; it wobbles and stops quickly.
In water, both sink. Holding them to the light, the difference in color is hard to see. The sound of shaking is not clearly different either.
Because you think of other methods, such as whether it floats in water.
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