Density and Bouyancy?

1.) An empty metal soap dish barely floats in water. A bar of ivory soap floats in water. When he soap is stuvk in the soap dish, the combination sinks. Why?

2.) When an obj. is immersed in a liquid at rest, why is the net force on the object in the horizontal direction equal to zero?

3.) A barge is carrying a load od gravel along a river. It approaches a low bridge and the captain realizes that the top of the pile of gravel is not going to make it uder the bridge. The captain orders the crew to quickly shovel gravel from the pile into the wateris this a good decision?

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