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Interview Question

Mechanical Engineering Intern Interview Northridge, CA

You are in a boat in a pool with a rock in your hand. You

  throw the rock into the pool. Does the water level rise, drop, or stay the same?
Answer

Interview Answer

4 Answers

0

depends on how big the pool is and how accurately you can measure the water rise

Anonymous on May 10, 2010

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5

If the rock were neutrally buoyant the water level would remain the same. It is heavier than water which causes it to displace more than its own volume while in the boat compared to at the bottom of the lake. Therefore the water level of the lake would go down.

Ben on Oct 1, 2010
0

At the moment the rock leaves your hand the water falls in the pool. When the rock enters the water the water level of the pool rises again to the level it had before you threw it.

Homebrook on Dec 15, 2013

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