Friday, January 8, 2010

What is the buoyant force of an object that weights 35N displaces water that weighs 25N?

please explain too please!!What is the buoyant force of an object that weights 35N displaces water that weighs 25N?
The buoyant force is 25N.





The weight of the water displaced is equal to the buoyant force. This is sort of Archimedes' principle for dummies. To get this object to float you would have to modify its shape to get it to displace more water (at least 35N worth). To demonstrate this you could take some foil, make a boat and add some weight. Place the boat in the water and it will float. Then take the foil and crumple it up around the weight. You now have exactly the same MASS as before but when you place it in the water now it will sink. This is because you modified the VOLUME. When it was shaped like the boat it displaced more water (more water displaced means more buoyant force to push up on the boat). I hope this helps. Let me know if you need clarification or more detail.

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