What happens to the water level in a pool if a rock is thrown overboard out of a boat?
Complete question:
A boat loaded with rocks is floating in a swimming pool. If the rocks are thrown into the pool, the water level in the pool, after the rocks have settled to the bottom:
a. rises
b. falls
c. stays the same
d. there is not enough information to answer
please which is the correct answer (explain your reasoning). Thanks
It goes down.
When the rock is in the boat (assuming the rock has a density greater than water), it displaces a volume of water greater than it’s volume, enough to equal it’s weight.
When you throw it over, it will only displace it’s own volume, so the amount of water displaced goes down.
displace a smaller amount of water, and the water level goes down.
The last step is unclear (at least to me). In more detail:
Take the rock and put it on the ground. The water level goes down, as the volume displaced by the rock is missing. Take the rock and put it in the water. The water level goes up, but not as far as it was, as the displacement is smaller. net, it goes down.
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