A fisherman and his young niece are in a boat on a small pond. Both are wearing
ID: 1461053 • Letter: A
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.
Rises Falls Unchanged Cannot tell The niece finds a cup and bails some water out of the bottom of the boat
Rises Falls Unchanged Cannot tell The fisherman knocks the tackle box overboard and it sinks to the bottom.
Rises Falls Unchanged Cannot tell The fisherman lowers the anchor and it hangs one foot above the bottom of the pond.
Rises Falls Unchanged Cannot tell The niece gets in the water and pops the helium ballon
Rises Falls Unchanged Cannot tell The fisherman lowers himself in the water and floats on his back.
Rises Falls Unchanged Cannot tell The niece pops the helium balloon.
Explanation / Answer
When
1. The niece finds a cup and bails some water out of the bottom of the boat -- the water leverl unchanged
2. The fisher man knocks the tackle box overboard and it sinks to the bottom -- the waterlevel falls
( mass increases)
3. The fisher man lowers the anchor and it hangs one foot above the bottom of the pond
the water level --- unchanged ( same mass )
4. The niece gets in the water and pops the helium ballon -- the water level raises ( mass decreased )
5. The fisher man lowers himself in the water and floats on his back -- the water lever unchanged ( same mass )
6. The niece pops the helium ballon -- the water level Rises ( mass (helium ballon mass) decreases so rises)
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