A fisherman and his young niece are in a boat on a small pond. Both are wearing

Question

A fisherman and his young niece are in a boat on a small pond. Both are wearing life jackets. The niece is holding a large helium filled balloon by a string. Consider each action below independently and indicate whether the level of the water in the pond, Rises, Falls, is Unchanged or Cannot tell.

The fisherman lowers the anchor and it hangs one foot above the bottom of the pond.
The fisherman fills a glass with water from the pond and drinks it.
The niece pops the helium balloon.
The fisherman knocks the tackle box overboard and it sinks to the bottom.
The niece gets in the water and pops the helium ballon
The fisherman lowers himself in the water and floats on his back.

Think about Archimedes Principle. How does the volume of fluid displaced by a body which `floats' differ from that for a body which sinks?

Think about Archimedes Principle. How does the volume of fluid displaced by a body which `floats' differ from that for a body which sinks?

Explanation / Answer

The fisherman lowers the anchor and it hangs one foot above the bottom of the pond. unchanged

The fisherman fills a glass with water from the pond and drinks it .unchanged

The niece pops the helium balloon. unchanged

The fisherman knocks the tackle box overboard and it sinks to the bottom.   Falls

The niece gets in the water and pops the helium ballon Falls

The fisherman lowers himself in the water and floats on his back. unchanged

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