Volume of rocks

Haley B.

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Apr 24, 2013
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It sounds simple, but I'm stumped. The question says, "When you put a rock into a container of water, it raises the water level 3cm. If the container is a rectangular prism whose base is 15cm by 15cm, what is the volume of the rock?" I don't want it done for me, I just need some helpful hints to get me started. Thanks.
 
It sounds simple, but I'm stumped. The question says, "When you put a rock into a container of water, it raises the water level 3cm. If the container is a rectangular prism whose base is 15cm by 15cm, what is the volume of the rock?"I don't want it done for me, I just need some helpful hints to get me started. Thanks.
There is a fixed volume of water. When the rock is placed in the water, it displaces a volume of water equal to its own volume. The surface of the water rises, so the total volume in the container is the sum of the water volume plus the rock volume. The numbers given in the problem tell you the change of total volume when the rock is submerged.

ok?
 
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