Question

A fisherman and his young nephew are in a boat on a small pond. Both are wearing life jackets. The nephew is holding a large floating helium filled balloon by a string. Consider each action below independently, and indicate whether the level of the water in the pond R-Rises, F-Falls, S-Stays the Same, C-Can't tell. (If in the first the level Rises, and in the second it Falls, and for the rest one Cannot tell, enter RFCCC)

A) The fisherman lowers himself in the water and floats on his back
B) The fisherman fills a glass with water from the pond and drinks it.
C) The nephew gets in the water, looses his grip on the string, letting the balloon escape upwards.
D) The fisherman knocks the tackle box overboard and it sinks to the bottom.
E) The nephew pops the balloon.

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

Answer 1

he son pops a helium filled balloon that he is holding by a string. (Id say unchanged since the ballon is floating in the air right)




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The fisherman fills a glass with water from the pond and drinks it. (No idea, but i would guess that it stays the same since the weight is being put back into the fisherman) im confused on this one

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The son gets in the water and pops the floating helium ballon (Raises because the son is displacing water?) unchanged because the displacing bodies are still the boat + the son

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The fisherman lowers the anchor and it hangs one foot above the bottom of the pond (Falls, same reason as above) unchanged because the anchor is still pulling the boat down

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